Conflicts are raging across the globe. China is beginning to establish the framework to seize Taiwan. Russia and Ukraine have had an ongoing and extremely violent conflict now for years. More recently, after the October 7, 2023 attack on Israel by Hamas, Israel began a crushing defensive sweep against Gaza. If you look anywhere online, you’ve probably seen numerous calls to action from American citizens begging the U.S. government to intervene and protect Palestinians from harm. Yet, despite these loud voices for intervention, it seems that U.S. citizens are not actually that interested in getting involved in other countries’ wars. One poll conducted by YouGov found that 79% of Americans did not agree with foreign intervention unless the United States was being directly attacked. Another saw 56% of people polled saying that the U.S. should not pick a side between Israel and Gaza. (These are the most pro-Israel U.S. presidents.)
Despite U.S. citizens being apparently against foreign intervention, the United States itself has intervened militarily in nearly half the countries of the world. We’ve assembled the most comprehensive list we can from sources like the Global Policy Forum, the United States Senate, the World Population Review, and others. This information can help you think through how past U.S. interventions have influenced our relations with countries today, and what level of intervention is justified today to maintain national security and international trade.
Keeping It In Context
Some people think the United States has overreached, taking on the role of “world policeman.” Others believe if the U.S. did not take this role, autocratic countries would fill the vacuum, leading to larger and more violent roles and disruption of international trade. Regardless of your perspective, it is simplistic to paint all American interventions abroad with the brush of “imperialism.” U.S. objectives have changed over time:
- Territorial expansion was a prime motive early in the country’s growth.
- Later, competition with European empires for access to foreign markets led to naval clashes and landing troops in various parts of the world to support U.S. business interests and defend American citizens.
- The U.S. was dragged unwillingly into World War I and II. These conflicts broke up the European empires and brought the U.S. to global leadership.
- In the postwar period, the United States intervened in countries to prevent or reverse the spread of communism, to preserve freedom of trade on the seas, to stop out-of-control civil wars, and to disrupt terrorist networks.
Here is a comprehensive overview of U.S. foreign intervention:
Countries the U.S. Invaded After Declaring War
In Article 1, Section 8, Clause 11, the U.S. Constitution gives Congress the authority to declare war. The Constitution does limit the president’s ability to declare war, though the president can move forward with military direction once Congress has officially declared that the U.S. is at war. So far, the United States has declared war against 11 foes through five conflicts.
The War of 1812
The War of 1812 was a clash between the United States and Great Britain that lasted for a total of three years. The United States declared war against Britain over maritime rights. During the course of the conflict, American troops actually invaded Canada. But they were unable to retain control over any Canadian territory.
The Mexican War
The United States formally declared war on Mexico from 1846-8 to settle the Texas border and seize more territory for settlers. At the end of the war, the U.S. annexed nearly half of Mexico’s territory, including California and the other southwestern states. Altogether, this accounted for over 500,000 square miles of new territory.
The Spanish-American War
In 1898 the U.S. Congress declared war on Spain to support Cuba’s quest for independence. Afterward, the Americans kept the former Spanish colonies of Puerto Rico, Guam, and the Philippines as colonies. The Philippines later gained independence in 1945.
World War I
The United States declared war on Germany and Austria-Hungary in 1917 near the end of World War I. The Americans had tried to stay out of the war, but German targeting of American shipping and efforts to instigate Mexico to attack the U.S. were two of the influential factors drawing the U.S. in. Fresh American troops helped bring the conflict to an end in about 18 months.
World War II
A surprise Japanese attack on Pearl Harbor in 1941 precipitated a U.S. declaration of war against the Empire of Japan, and shortly later against Germany and Italy as well. The following year, Congress passed declarations of war against Bulgaria, Hungary, and Romania, which had allied with Germany for protection against the Soviet Union and for German support for their territorial ambitions. The war concluded in 1945 when the U.S. dropped two atomic bombs on Japan.
Major Undeclared Wars
The United States has engaged in undeclared military action throughout its history. One of the advantages of not declaring war is that the military can retain the element of surprise in its operations, rather than announcing the war through a Congressional debate and vote. It also permits rapid responses to fast-emerging threats. However, getting involved in conflicts without first getting a Congressional declaration of war gives Presidents a huge amount of power that may go beyond what the writers of the Constitution envisioned.
The Barbary Wars
The country’s first major foreign military engagement was against the Barbary states which included Algiers, Morocco, and Tunis. Barbary pirates on the Mediterranean coast of northwest Africa had been harrassing U.S. ships and extorting financial tributes for full access to the ships’ routes. In the Barbary Wars, the U.S. waged war against Tripoli from 1801-1805 and Algiers from 1815-16. Today these cities are part of Libya and Algeria, respectively. The War ended once the U.S. affirmed that it had the full ability to ship on its routes without threat.
The Annexation of Hawaii
In 1893, American plantation owners instigated a rebellion to overthrow Queen Liliuokalani of Hawaii. American Marines backed up the coup and the new provisional government applied for annexation to the United States. This action was provoked in part because the U.S. Congress placed tariffs on imported sugar. By becoming part of the United States, Hawaiian planters would not be subject to the tax on foreign commodities.
The Russian Civil War
After communists took over Russia in 1917, a civil war broke out across the country. The United States, along with a dozen or so other countries, sent troops into Russia from 1918-22 to guard critical infrastructure and assist the counter-revolutionary forces. This effort was ultimately unsuccessful.
The Korean War
At the end of World War II, Korea was divided into two countries. Communist North Korea launched a surprise attack on the South in 1950. The United States and a multinational coalition fought an undeclared war from 1950-53 that drew in China and resulted in a return to the status quo. Though we call this violent and costly conflict a war, it doesn’t meet the legal definition of a U.S. war because Congress never passed a formal declaration of war.
The Vietnam War
Much like the Korean War, the Vietnam War saw a U.S.-led multinational coalition trying to defeat the Communist North, which was invading the South. The Americans invested 20 years and nearly 60,000 lives but were ultimately defeated in 1975. Communists went on to take over the rest of Indochina as well: the countries of Cambodia and Laos.
The Invasion of Grenada
In 1983, President Reagan ordered the U.S. armed forces to invade Grenada to remove a Marxist government and halt Soviet and Cuban work on a military-grade airstrip. The military government had just taken power days earlier in a violent and bloody coup. Nicholas Brathwaite was eventually placed as the leader of Grenada until democratic elections could be held a year later. Grenada today has no military, only a local police force.
The Invasion of Panama
In 1989-1990, President George H.W. Bush deployed 27,000 troops backed up with naval and air power to take control of Panama and take its military leader, General Manuel Noriega, into custody. Noriega was convicted of drug trafficking and served 17 years in a Miami prison, then was extradited to France where he served seven years for money laundering. He finally returned to Panama and died in 2017 at age 83.
Intervention in Yugoslavia
After the collapse of communism in Eastern Europe, Yugoslavia fell apart in a series of civil wars that created 7 independent countries: Slovenia, Croatia, Bosnia and Herzegovina, Serbia, Montenegro, North Macedonia, and Kosovo. Two times during these wars the United States engaged in combat together with its NATO allies.
In 1995, the Western Alliance conducted air strikes against the Serbian forces in the Bosnian civil war, forcing them to accept a peace agreement. In 1999, NATO repeated this action to force Serbia to withdraw from Kosovo, which was declared an independent state. In both cases, Western intervention came after Serbian atrocities and ethnic cleansing activities.
The Gulf Wars
The U.S. and its allies went to war twice against Iraq. The first Gulf War occurred in 1990-91 when Iraq invaded Kuwait and threatened the Saudi oilfields. A US-led international coalition liberated Kuwait. A second coalition war against Iraq took place from 2003-2011 to remove dictator Saddam Hussein from power and search for alleged weapons of mass destruction programs. American military forces remained in Iraq to stabilize the country and combat terrorism until 2021. Some troops remain to this day in a training capacity for the Iraqi military.
The War in Afghanistan
Americans and coalition partners invaded Afghanistan in 2001 to remove the Taliban from power and seek to capture Osama bin Laden, the terrorist mastermind of the 9-11 attacks. The war dragged on for 20 years until President Biden withdrew American forces in 2021. Shortly thereafter, the Taliban retook control of the country.
Smaller Engagements
Throughout the country’s history, the U.S. armed forces have fought smaller and less well-known engagements. Many of these took place during the age of imperialism when “gunboat diplomacy” was used to back up American business interests, to quell uprisings, and to establish spheres of influence to exclude European rivals. Space does not permit investigating them all here, but if this list sparks your curiosity, it can be a starting place for your own research. These are arranged by the first date of military conflict:
- France, Britain, and Spain (1798-1810, 1814-25) — Caribbean naval conflicts.
- Spain (1810-1819) — Conflicts in Florida leading to annexation.
- Greece (1827) — Marines invaded three islands.
- Dutch East Indies (1832, 1838) — Punitive naval operations.
- Ivory Coast (1843)
- Argentina (1833, 1852-53, 1890) — Troops intervened multiple times near Buenos Aires.
- Peru (1835-6) — Marines intervened with counter-insurgency operations.
- Mexico (1836, 1842, 1846-8, 1859, 1876, 1913-16) — Helping Texas achieve independence, pursuing criminals, pressuring the Mexican government.
- Fiji (1840-41, 1858)
- Samoa (1841, 1885, 1888, 1899)
- China (1843-1937)
- Nicaragua (1854-1933) — Multiple interventions in different cities starting in the mid-19th century. Full occupation of the country from 1912-33.
- Uruguay (1855, 1858, 1868)
- Colombia (1856-1895, 1901-03) — Multiple interventions for counter-insurgency campaigns and finally detaching Panama as a separate country to win favorable terms to build the Panama Canal.
- Portuguese West Africa (1860)
- Japan (1863-4, 1868)
- Korea (1871, 1894-96, 1904-5)
- Egypt (1882)
- Haiti (1888-1934, 1959, 1994-96, 2004) — Multiple interventions and occupations to change governments and stabilize the country.
- Chili (1891)
- Honduras (1903, 1907-12, 1919, 1924-25)
- Dominican Republic (1903, 1916-24, 1965)
- Cuba (1906-9, 1912, 1914, 1917-33)
- Panama (1908, 1912, 1918-20, 1925) — Navy, Marine, and Army interventions multiple times to stabilize the country and safeguard the Canal.
- Yugoslavia (1919)
- Guatemala (1920, 1966-67)
- Turkey (1922)
- El Salvador (1932)
- Iran (1946)
- Greece (1947-49) — U.S. forces engaged in counterinsurgency operations.
- Philippines (1948-54) — Undercover commando operations.
- Lebanon (1958) — 14,000 U.S. marines and army units were depl0yed.
- Laos (1965-73) — Bombing campaign and cross-border operations as part of the Vietnam War.
- Cambodia (1969-75) — Bombing campaign as part of the Vietnam War.
- Iran (1980, 1984, 1987-88)
- Libya (1981, 1986, 1989) — retaliatory strikes for terrorism.
- Liberia (1990, 1997) — Intervention in civil war.
- Somalia (1992-94) — Peacekeeping forces
- Sudan (1998) — Airstrike
- War on Terror (2001-present) — Global counterterrorism strikes that began after the 9-11 attacks on New York and Washington, D.C.
- Yemen (2024) — Airstrikes on Houthi rebels in retaliation for missile and drone attacks on Red Sea shipping.
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Author: Jessica Lynn
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