The history of Persia spans thousands of years and includes some of the world’s earliest and most influential empires. The Achaemenid Empire, founded by Cyrus the Great in the 6th century BCE, became one of the largest empires in history. Persia later saw the rise of the Parthian and Sassanian Empires before being conquered during the Islamic expansion in the 7th century. Over time, Persian culture, language, and identity endured through various dynasties. 
The transition from Persia to Iran was not the creation of a new country, but rather a shift in how the nation was identified internationally. The people of the country had long referred to it as “Iran,” meaning “land of the Aryans.”

In 1935, Reza Shah Pahlavi formally requested that foreign governments use the name Iran in diplomatic correspondence. This change was part of a broader effort to modernize the nation, assert independence from foreign influence, and emphasize a unified national identity rooted in its ancient past. 
Ultimately, the shift symbolized more than a name change—it reflected nationalism, modernization, and a desire to define the country on its own terms rather than through a Western lens.

From 1935 to 1953, Iran experienced major political and social transformation under the Pahlavi dynasty. Reza Shah Pahlavi pushed modernization—expanding railroads, education, and a more secular legal system—while reducing the public role of religion. In daily life, especially in cities, many Iranians adopted more Western-style clothing, education, and cultural practices, though rural areas remained more traditional.
In 1941, during World War II, Allied forces occupied Iran, and Reza Shah was replaced by his son, Mohammad Reza Shah Pahlavi.

In the early 1950s, Mohammad Mossadegh rose to power, reflecting growing nationalism. Iranian society at the time was mixed—urban populations tended to be more moderate and secular, while rural communities remained deeply religious and traditional, creating a dynamic but sometimes tense cultural balance.
The 1953 overthrow of Iran’s government, known as 1953 Iranian coup d'état, involved key domestic and international players. Iran’s Prime Minister Mohammad Mossadegh had nationalized the oil industry, challenging British control. In response, Central Intelligence Agency and MI6 collaborated to remove him, fearing both economic loss and potential Soviet influence during the Cold War.
The purpose of the operation was to restore Western influence over Iranian oil and maintain Iran as a stable, anti-communist ally. The coup reinstated the authority of Mohammad Reza Shah Pahlavi, who had briefly fled the country.
The outcome was the removal of Mossadegh, the strengthening of the Shah’s rule, and the establishment of a more authoritarian government. In the long term, it fueled resentment toward the United States and Britain, contributing to tensions that would later play a major role in the Iranian Revolution.

After the 1953 Iranian coup d'état, Mohammad Reza Shah Pahlavi consolidated power and increasingly ruled in an authoritarian manner. While he promoted modernization through the White Revolution—expanding education, land reform, and women’s rights—political opposition was suppressed. Central to this control was SAVAK, the regime’s intelligence and security agency, which monitored dissent, censored opposition, and was widely accused of torture, imprisonment, and execution of political critics.
In daily life, many urban Iranians experienced modernization and economic growth, but political freedoms were limited. Corruption, inequality, and the concentration of wealth among elites fueled growing frustration. Religious leaders, including Ruhollah Khomeini, criticized the Shah’s Westernization and lack of political legitimacy.

By the late 1970s, resentment had spread across multiple segments of society—students, intellectuals, workers, and religious communities. This convergence of grievances, combined with repression and economic strain, led to widespread protests in 1978, setting the stage for the collapse of the monarchy and the coming revolution.

The chain of events that reshaped U.S.–Iran relations began with the Iranian Revolution, which brought down the regime of Mohammad Reza Shah Pahlavi. Years of authoritarian rule, repression by SAVAK, and resentment over Western influence fueled a broad coalition of opposition. This movement ultimately elevated Ruhollah Khomeini, who established an اسلامی Republic grounded in religious authority and anti-Western sentiment.
Tensions with the United States escalated dramatically in November 1979 with the Iran hostage crisis. Iranian militants seized the U.S. Embassy in Tehran, taking 52 American diplomats and citizens hostage. The crisis quickly became a defining moment in global politics and American public life. Nightly news coverage kept the situation constantly in the public eye, most notably through the program that would become Nightline, which began as a special report tracking the number of days Americans were held captive.

In April 1980, the United States attempted a military rescue mission known as Operation Eagle Claw. The operation ended in failure due to mechanical problems and a deadly collision in the Iranian desert, killing eight American servicemen. This failure further damaged confidence in Jimmy Carter’s leadership.
At the same time, the U.S. was struggling with high inflation, economic stagnation, and a broader sense of uncertainty. The hostage crisis became symbolic of what many Americans viewed as declining global influence and ineffective leadership. These conditions contributed to the political environment leading into the 1980 election, where Ronald Reagan capitalized on public frustration, projecting strength and a renewed sense of national confidence.

The crisis ended on January 20, 1981, the day Reagan was inaugurated, when the hostages were finally released after 444 days in captivity. The timing reinforced perceptions of a shift in American leadership and marked a turning point in both U.S. domestic politics and its relationship with Iran for decades to come.

After Ronald Reagan took office in 1981, the Middle East became a major focus of U.S. foreign policy, particularly in response to the ongoing Iran-Iraq War. Iran, under its Islamic Republic, had become increasingly religiously conservative, with the government emphasizing Shiite clerical authority in politics, law, and daily life. The revolution’s ideology alarmed neighboring Iraq, where Saddam Hussein, a secular Arab nationalist, feared the spread of revolutionary Shiite ideas to Iraq’s own Shiite population. In September 1980, Hussein invaded Iran, igniting a brutal war that would last eight years.

The Reagan administration, aiming to contain Iran’s influence and maintain regional stability, tilted U.S. policy in Iraq’s favor. The United States provided intelligence, dual-use technology, economic assistance, and facilitated arms transfers indirectly, even though Iraq also received major weapons from the Soviet Union, France, and China. By supporting Iraq, the U.S. sought to prevent an Iranian victory without directly entering the conflict.
This support helped Iraq sustain its war effort into the mid-1980s, while Iran faced an international arms embargo. The war caused massive casualties and destruction, deepened regional rivalries, and solidified Iran’s commitment to religious‑political governance, while demonstrating U.S. willingness to back authoritarian regimes strategically when it aligned with American interests.

After 1985, U.S. policy in the region became even more complicated with the secret Iran‑Contra operations. Despite publicly maintaining an arms embargo against Iran, senior Reagan administration officials authorized covert arms sales to Iran, often using Israel as an intermediary to deliver U.S.-made weapons. The ostensible goal was to secure the release of American hostages held by Iran‑linked groups in Lebanon, but only a few were freed, and much of the payment from Iran was secretly diverted to fund the Contras in Nicaragua, violating U.S. law.
At the same time, the United States continued selling arms and providing intelligence to Saddam Hussein’s Iraq to prevent an Iranian victory, effectively supporting both sides of the conflict. This dual-track strategy illustrated Washington’s priority of containing Iranian influence and maintaining regional stability over ideological consistency.
This support helped Iraq sustain its war effort into the mid-1980s, while Iran faced an international arms embargo. The war caused massive casualties and destruction, deepened regional rivalries, and solidified Iran’s commitment to religious‑political governance, while demonstrating U.S. willingness to back authoritarian regimes strategically when it aligned with American interests.

When the Iran–Iraq War finally ended in 1988 under United Nations resolution mandates, Iran was left physically and economically devastated. The war had consumed roughly a decade of national life, claiming hundreds of thousands of lives, destroying infrastructure, and draining national resources. Iranian cities, industrial zones, and agricultural regions faced extensive damage, leaving reconstruction as a central government priority. The economy struggled with inflation, unemployment, and limited access to international trade due to wartime sanctions and isolation. 
Politically, the Islamic Republic emerged with its core institutions largely intact and its religious‑political leadership unchallenged, reinforcing the role of clerics and the Islamic Revolutionary Guard Corps in governance. The war experience strengthened nationalistic narratives tied to resistance and martyrdom, deepening the regime’s ideological legitimacy among many Iranians. Internationally, Tehran remained isolated from Western governments but sought to extend influence through regional alliances and support for sympathetic movements and non‑state actors. Iran’s emphasis on self‑sufficiency and resistance diplomacy shaped its foreign policy in subsequent decades.

When Saddam Hussein invaded Kuwait on August 2, 1990, Iran’s reaction was cautious and principled. Unlike most Gulf states and Western governments, which quickly condemned the invasion and formed a U.S.‑led coalition, Tehran took a stance emphasizing respect for national sovereignty and non‑aggression. Iran saw Iraq’s action as another example of aggressive expansionism following its brutal eight‑year war with Iraq that had ended in 1988. 
Iran refrained from joining the Western coalition and did not support Saddam’s annexation. Instead, it favored a diplomatic resolution through the United Nations and urged other governments to uphold international law regarding territorial integrity. Tehran’s position reflected both ideological opposition to unilateral aggression and pragmatic concern about instability on its own borders.
While Iran did not align itself with the U.S. coalition, it also did not actively oppose efforts to liberate Kuwait. The government was wary of entanglement with Western military forces but publicly backed U.N. Security Council resolutions demanding Iraq’s withdrawal, highlighting differences between revolutionary rhetoric and strategic caution amid shifting regional dynamics.

After the 1991 Gulf War, Iran emerged from its long conflict with Iraq weakened but still politically unified under the Islamic Republic. Tehran declared neutrality during the liberation of Kuwait, wary of provoking further conflict on its borders, but it also saw opportunities to improve bilateral ties once the common threat of Saddam Hussein diminished. Iran’s leadership focused on reconstruction, economic survival, and regional influence, particularly through cultivating ties with Russia and other non‑Western powers to offset U.S. dominance in the Gulf. Tehran also began modest cooperation with Russia on military and nuclear technology, including the Bushehr nuclear plant, as part of broader diplomatic engagement following the Soviet collapse. 
Domestically, Iran experienced rising tensions between conservative clerical authorities and reformist political movements, most visible with the election of President Mohammad Khatami in 1997. Khatami’s presidency encouraged limited domestic reform and a more open cultural atmosphere, including efforts to improve international relations—especially with Europe and, at times, the U.S. These overtures briefly eased some sanctions and created cautious optimism about diplomatic thaw, although deep mistrust remained on both sides. 
U.S.–Iran relations during the 1990s were dominated by escalating sanctions and strategic distancing. The U.S. imposed targeted sanctions throughout the decade, including trade embargoes and legislation aimed at limiting Iran’s military capabilities. This reinforced Iran’s self‑image as a besieged state resisting Western pressure, narrowing political space for sustained engagement. 
Following the September 11, 2001 attacks, Iran publicly condemned the violence and offered sympathy for the U.S. While Iran ultimately did not align with broader U.S. policy in the region, it cooperated discreetly in the early stages of the Afghanistan campaign against the Taliban—a mutual adversary—by sharing intelligence and facilitating diplomatic contacts. Iranian diplomats also participated in the Bonn talks on Afghanistan’s future government. 
However, this brief cooperation was overshadowed in early 2002 when President George W. Bush labeled Iran part of an “axis of evil,” dramatically worsening relations and reinforcing hardline positions in Tehran. By linking Iran with Iraq and North Korea, the U.S. political rhetoric undercut reformist efforts and bolstered conservative resistance to rapprochement. 
Overall, from the post‑Gulf War period through the post‑9/11 era, Iran remained strategically isolated from the United States, economically challenged by sanctions, yet cautiously assertive regionally, and internally torn between reformist aspirations and conservative control.

After being labeled part of the “axis of evil” by President George W. Bush in 2002, Iran’s global position became increasingly defined by tension with the United States and its allies. The designation, framed around accusations of supporting terrorism and pursuing weapons of mass destruction, reinforced Tehran’s perception of being under Western siege. In response, Iran strengthened relationships with non-state actors such as Hezbollah and Hamas, providing financial support, training, and weapons. These alliances became part of Iran’s “Axis of Resistance,” positioning Tehran as a supporter of anti-Israel groups and a counterbalance to U.S. influence in the Middle East.
Regionally, Iran remained ideologically opposed to Israel, consistently criticizing its policies toward Palestinians and supporting groups resisting Israeli control. This stance bolstered Iran’s regional influence but also fueled ongoing conflict with Gulf States and Western nations. Domestically, the Islamic Republic maintained tight control, with clerical authorities balancing limited reformist pressures under presidents like Mohammad Khatami while sustaining the Revolutionary Guard’s influence in politics and the economy.
Internationally, negotiations over Iran’s nuclear program dominated Tehran’s diplomatic engagement. In July 2015, Iran reached the Joint Comprehensive Plan of Action (JCPOA) with the P5+1 nations (United States, United Kingdom, France, China, Russia, and Germany). The agreement imposed limits on uranium enrichment, reduced Iran’s stockpile of enriched uranium, and instituted extensive inspections by the International Atomic Energy Agency (IAEA) in exchange for sanctions relief. The deal represented a rare period of constructive engagement with Western powers, providing Iran with economic opportunities and partial reintegration into the global financial system.

Throughout this period, Iran’s combination of ideological steadfastness, sponsorship of Hezbollah and Hamas, and cautious engagement through the JCPOA defined its complex role on the global stage. Tehran projected regional influence while managing its fraught relationship with the United States, all while pursuing a nuclear program under strict international scrutiny and maintaining domestic political stability.
After the United States withdrew from the 2015 Iran nuclear deal (JCPOA) in 2018, Washington reimposed and expanded sanctions under the so‑called “maximum pressure” campaign, aimed at constraining Iran’s nuclear program and reducing its regional influence. Without the sanctions relief that the deal provided, Iran’s economy struggled under restrictions on oil exports, finance, and trade—amplifying domestic hardship and limiting diplomatic engagement. Tehran continued advancing its nuclear capabilities in the absence of a revived agreement. 
During the COVID‑19 pandemic, Iran faced severe public health challenges, with widespread infections and economic strain exacerbated by ongoing sanctions. The pandemic placed additional pressure on Iran’s healthcare system and economy, slowing growth and contributing to internal discontent. (Though specific pandemic data aren’t always fully transparent, sanctions were widely reported to worsen access to medical supplies and economic capacity.)
Under the Joe Biden administration, the U.S. signaled interest in reviving nuclear negotiations, but talks faltered as Tehran demanded stronger guarantees and expressed mistrust of U.S. commitment after the prior U.S. withdrawal. Relations remained tense, and proxy conflicts in the region continued, with Iranian‑backed militias conducting attacks and the U.S. responding with limited strikes.

When the Hamas launched its deadly October 7, 2023 attack on Israel, Iran’s U.N. mission publicly called it a “legitimate defense against…occupation,” while denying direct involvement in planning the assault. Tehran’s long‑standing sponsorship of Hamas and the Lebanese group Hezbollah has cemented its role as a key supporter of armed resistance against Israel, but it also attracted heightened scrutiny and pressure from the U.S. and Gulf partners.
Following October 7, Iran’s regional posture hardened: it coordinated with allied militias and employed a “unity of fronts” strategy to exert pressure on Israel from multiple directions, while cautiously avoiding full‑scale war—though direct engagements and reprisals increased. At the same time, some analysts noted Iran’s overarching goal was to influence cease‑fire negotiations and sustain support for allied groups despite military setbacks.

On January 21, 2025, Donald J. Trump was inaugurated as the 47th President of the United States. From the outset, his administration adopted an aggressive stance toward Iran, framing Tehran as a destabilizing force in the Middle East and a threat to U.S. security. Trump emphasized Iran’s nuclear program, regional militancy, and support for proxy groups such as Hezbollah and Hamas. Diplomatic avenues from the prior JCPOA were effectively closed, and sanctions were expanded to restrict Iran’s oil exports, financial networks, and international trade. Tehran rejected U.S. conditions, viewing them as humiliating and one-sided, creating an environment of growing tension.
By mid-2025, intelligence reports indicated Iran had accelerated uranium enrichment at facilities such as Natanz and Fordow. In response, the United States and Israel coordinated precision airstrikes on Iranian nuclear installations, aiming to delay nuclear weapons development and degrade Tehran’s military infrastructure. Israel provided intelligence and support, while U.S. forces executed targeted strikes on uranium enrichment plants and related research facilities. Iran condemned the attacks as a violation of sovereignty, increasing military readiness and reinforcing Revolutionary Guard deployments. These strikes marked the first direct U.S.-Israeli assault on Iranian nuclear sites, significantly escalating regional instability and setting the stage for future confrontation.

During June and July 2025, Iran conducted missile and naval exercises in the Persian Gulf and along its borders, signaling defensive readiness. Domestic messaging emphasized resistance to foreign aggression, particularly from the U.S. and Israel, while Tehran reinforced support for regional proxies. Back-channel diplomatic efforts through European intermediaries were limited and ultimately ineffective in preventing confrontation. Energy markets reacted to the perceived threat to the Strait of Hormuz, highlighting the global economic stakes.
Throughout late 2025 and early 2026, Trump escalated rhetoric, repeatedly threatening decisive action if Iran continued nuclear development or proxy attacks. U.S. military forces were increasingly deployed to the Persian Gulf, while Iran’s leadership expressed defiance and warned of retaliation.
On February 28, 2026, tensions culminated in full-scale bombing operations targeting Iranian military and nuclear facilities. U.S. and Israeli forces struck uranium enrichment sites, research centers, and key military infrastructure to eliminate nuclear capabilities and reduce Tehran’s influence over regional proxies. Iran retaliated with missile attacks on U.S. and allied bases and closed the Strait of Hormuz, causing immediate disruption to global energy markets. Tehran framed the strikes as defending its sovereignty and vowed continued resistance.