Documented cases in which the United States, acting through military force, covert operations, economic pressure, or political manipulation, intervened in the sovereign affairs of other nations — frequently at the cost of those nations' democratic governance. Sources: declassified CIA and State Department documents, the 1975 Church Committee report, and peer-reviewed historical scholarship.
Selected documented U.S. foreign interventions — 1893 to present
Selected cases only — full documentation below
The Senate Select Committee to Study Governmental Operations with Respect to Intelligence Activities, chaired by Senator Frank Church, produced fourteen reports in 1975–1976 documenting covert CIA operations overseas including assassination plots against foreign leaders, the overthrow of elected governments, and the destabilisation of sovereign states. The reports are available through the National Archives and the U.S. Senate Historical Office.
The United States has repeatedly invoked the cause of freedom, democracy, and self-determination to justify action abroad. The documented record — drawing on the Church Committee reports, declassified CIA documents, State Department records, and peer-reviewed historical scholarship — shows a pattern that often contradicts these stated justifications.
The cases below are drawn from the confirmed documentary record. Each is sourced to official documents, congressional investigations, or declassified intelligence records.
Following the defeat of Spain, the Treaty of Paris (1898) transferred Cuba, Puerto Rico, Guam, and the Philippines to U.S. control. Puerto Rico and Guam remain U.S. territories whose residents are U.S. citizens but cannot vote for President. The Insular Cases (1901) established that the Constitution does not fully apply in U.S. territories.
→ Treaty of Paris, Library of CongressThe CIA, under Operation PBSUCCESS, organised and directed the overthrow of Guatemalan President Jacobo Árbenz, who had been democratically elected in 1950 and whose land reform programme threatened United Fruit Company holdings. The operation installed military dictator Carlos Castillo Armas. The CIA's own retrospective history of the operation, declassified in 1997, acknowledges the CIA's central role. A 40-year civil war followed in which an estimated 200,000 people were killed, predominantly Indigenous civilians — a fact documented by Guatemala's UN-sponsored Commission for Historical Clarification (1999).
→ CIA CREST Declassified ArchiveThe CIA recruited, trained, and directed a force of Cuban exiles in an attempt to overthrow Fidel Castro's government. The invasion failed. The Kennedy administration's post-mortem, the Taylor Report (1961), acknowledged U.S. government responsibility. The CIA also planned multiple assassination attempts against Castro, documented in the Church Committee's 1975 report "Alleged Assassination Plots Involving Foreign Leaders."
→ National Archives — related documentationPresident Johnson ordered 22,000 U.S. troops to the Dominican Republic, ostensibly to protect American citizens but also, as Johnson stated in a private telephone call (documented in declassified White House tapes), to prevent a "communist takeover." The intervention suspended a constitutionalist movement seeking to restore elected President Juan Bosch.
Declassified NSC documents and the Church Committee report document extensive U.S. efforts to destabilise the government of Salvador Allende, Chile's democratically elected socialist president. CIA Director Richard Helms's handwritten notes from a September 15, 1970 meeting with President Nixon record the instruction to "make the economy scream." The September 11, 1973 coup installed General Augusto Pinochet, under whose rule an estimated 3,000 people were killed or disappeared and 40,000 were tortured, according to Chile's National Commission on Political Imprisonment and Torture (Valech Commission, 2004).
→ Church Committee Report, Book IIThe Reagan administration funded and directed the Contras, a rebel force seeking to overthrow Nicaragua's Sandinista government, in defiance of the Boland Amendment passed by Congress to prohibit such funding. The International Court of Justice ruled in Nicaragua v. United States (1986) that the United States had violated international law by supporting the Contras and mining Nicaraguan harbours. The United States refused to accept the court's jurisdiction. The Iran-Contra Affair revealed the administration had secretly sold arms to Iran to fund the Contras.
→ ICJ — Nicaragua v. United States (1986)The United States invaded Panama with 27,000 troops, ousting General Manuel Noriega — a former CIA asset — citing drug trafficking and the safety of U.S. citizens. The UN General Assembly passed Resolution 44/240 condemning the invasion as a "flagrant violation of international law" (voted 75-20). Civilian casualties remain disputed; the Panamanian government estimated 500–600 civilian deaths.
The CIA and British intelligence (MI6) organised and funded the overthrow of Iran's democratically elected Prime Minister Mohammad Mosaddegh, who had nationalised the Anglo-Iranian Oil Company (now BP). The CIA's own declassified history of the operation, released in 2013, states that it "was carried out under CIA direction as an act of U.S. foreign policy." The coup restored Shah Mohammad Reza Pahlavi, whose SAVAK secret police subsequently tortured and killed thousands of dissidents. The 1979 Iranian Revolution and the hostage crisis were substantially shaped by this history.
→ CIA Declassified History of AJAXU.S. military involvement escalated from advisory support in the 1950s to over 500,000 troops by 1969. The Gulf of Tonkin Resolution (1964) — passed after an incident the Pentagon Papers (declassified 1971) revealed was misrepresented to Congress — provided legislative authorisation. An estimated 2–3.5 million Vietnamese civilians and combatants were killed. The My Lai Massacre (1968), in which U.S. soldiers killed between 347 and 504 unarmed South Vietnamese civilians, was documented in a U.S. Army investigation (Peers Report, 1970).
→ Pentagon Papers, National ArchivesThe CIA funded and armed Afghan mujahideen fighting Soviet forces in Afghanistan — the largest covert operation in CIA history, ultimately costing approximately $3 billion. The programme, documented in declassified CIA records and the memoirs of CIA Director Robert Gates, included funding of factions that later became or cooperated with al-Qaeda. National Security Advisor Zbigniew Brzezinski acknowledged in a 1998 interview that the programme began before the Soviet invasion.
The United States invaded Iraq on March 20, 2003, asserting that Iraq possessed weapons of mass destruction. The Senate Select Committee on Intelligence's Phase II report (2008) concluded that key pre-war intelligence assessments were "not substantiated by the intelligence" and that public statements about the threat were often unsupported or contradicted by underlying intelligence. No weapons of mass destruction were found. Estimates of Iraqi civilian deaths vary widely; the Iraqi Body Count project documented a minimum of 184,382 civilian deaths through violence between 2003 and 2019.
→ Senate Intelligence Committee, Phase II Report (2008)The Church Committee's 1975 report documented CIA plots to assassinate Patrice Lumumba, Congo's democratically elected first Prime Minister. Lumumba was ultimately killed by Congolese rivals with Belgian involvement, but the Committee found that CIA officers had planned and approved assassination operations against him. The CIA station chief cabled headquarters that he had "high hopes" Lumumba could be "eliminated." A 2001 Belgian parliamentary inquiry confirmed Belgian state responsibility for Lumumba's death.
→ Church Committee, Alleged Assassination Plots (1975)The cases above share several documented characteristics:
Resource and economic interests: In Iran (oil), Guatemala (United Fruit Company), and Chile (copper), U.S. interventions followed or preceded actions by target governments to nationalise industries or redistribute land from U.S.-connected corporations.
Cold War framing: Most interventions from 1947 to 1991 were justified through anti-communist rhetoric regardless of the actual political character of the target government. Árbenz in Guatemala, Mosaddegh in Iran, and Allende in Chile were all elected democratic leaders with social-democratic programmes rather than Soviet-aligned communist governments.
Support for authoritarian successors: In multiple documented cases, the governments that replaced U.S.-deposed democracies were authoritarian regimes responsible for documented human rights abuses: Pinochet in Chile, the Shah's Iran, successive military governments in Guatemala.
Long-term consequences: Multiple scholars of U.S. foreign policy — including official histories produced by the CIA itself — acknowledge that specific interventions contributed to long-term instability, anti-American sentiment, and conflict. The 1979 Iranian Revolution, the rise of Islamist movements in Afghanistan, and the emergence of ISIS in the power vacuum following the 2003 Iraq invasion are among the consequences documented in official and academic sources.
The Senate Select Committee's fourteen reports remain the most comprehensive official account of U.S. covert activities abroad. Available in full through the National Archives and the U.S. Senate Historical Office.
Church Committee Report — National Security Intelligence (Senate.gov) →