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Military Trains of the United States of America

The United States has officially declared war 11 times during five separate military conflicts. According to the Constitution (Article I, Section 8), Congress has the exclusive power to declare war. The last time America declared war was during World War II. Unofficially, the United States has been involved in 110 military conflicts of various types, called interventions or police actions to bypass the Constitutional requirement.



Mexican–American War (1846–1848)

The Mexican-American War of 1846 to 1848 marked the first U.S. armed conflict chiefly fought on foreign soil. It pitted a politically divided and militarily unprepared Mexico against the expansionist-minded administration of U.S. President James K. Polk, who believed the United States had a “Manifest Destiny” to spread across the continent to the Pacific Ocean. A border skirmish along the Rio Grande that started off the fighting was followed by a series of U.S. victories. When the dust cleared, Mexico had lost about one-third of its territory, including nearly all of present-day California, Utah, Nevada, Arizona and New Mexico.




American Civil War (1861–1865)

The Civil War in the United States began in 1861, after decades of simmering tensions between northern and southern states over slavery, states’ rights and westward expansion. The election of Abraham Lincoln in 1860 caused seven southern states to secede and form the Confederate States of America; four more states soon joined them. The War Between the States, as the Civil War was also known, ended in Confederate surrender in 1865. The conflict was the costliest and deadliest war ever fought on American soil, with some 620,000 of 2.4 million soldiers killed, millions more injured and much of the South left in ruin.




Spanish–American War (1898)

The Spanish-American War was an 1898 conflict between the United States and Spain that ended Spanish colonial rule in the Americas and resulted in U.S. acquisition of territories in the western Pacific and Latin America.





World War I (1914–1918, direct U.S. involvement in 1917–1918)

World War I, also known as the Great War, began in 1914 after the assassination of Archduke Franz Ferdinand of Austria. His murder catapulted into a war across Europe that lasted until 1918. During the conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Canada, Japan and the United States (the Allied Powers). Thanks to new military technologies and the horrors of trench warfare, World War I saw unprecedented levels of carnage and destruction. By the time the war was over and the Allied Powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.





Russian Civil War (1917–1923, direct U.S. involvement in 1918–1920)

The Russian Revolution of 1917 was one of the most explosive political events of the 20th century. The violent revolution marked the end of the Romanov dynasty and centuries of Russian Imperial rule. Economic hardship, food shortages and government corruption all contributed to disillusionment with Czar Nicholas II. During the Russian Revolution, the Bolsheviks, led by leftist revolutionary Vladimir Lenin, seized power and destroyed the tradition of czarist rule. The Bolsheviks would later become the Communist Party of the Soviet Union.

Allied intervention: The Western Allies armed and supported opponents of the Bolsheviks. They were worried about a possible Russo-German alliance, the prospect of the Bolsheviks making good on their threats to default on Imperial Russia's massive foreign loans and the possibility that Communist revolutionary ideas would spread (a concern shared by many Central Powers). Hence, many of the countries expressed their support for the Whites, including the provision of troops and supplies. Winston Churchill declared that Bolshevism must be "strangled in its cradle". The British and French had supported Russia during World War I on a massive scale with war materials. After the treaty, it looked like much of that material would fall into the hands of the Germans. To meet that danger, the Allies intervened with Great Britain and France sending troops into Russian ports. There were violent clashes with the Bolsheviks. Britain intervened in support of the White forces to defeat the Bolsheviks and prevent the spread of communism across Europe.





World War II (1939–1945, direct U.S. involvement in 1941–1945)

World War II was the biggest and deadliest war in history, involving more than 30 countries. Sparked by the 1939 Nazi invasion of Poland, the war dragged on for six bloody years until the Allies defeated the Axis powers of Nazi Germany, Japan and Italy in 1945. Explore the battles, leaders and atrocities from the war and its impact on geopolitics and humankind.





Cold War (1947–1991)

The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term cold war is used because there was no large-scale fighting directly between the two superpowers, but they each supported opposing sides in major regional conflicts known as proxy wars. The conflict was based on the ideological and geopolitical struggle for global influence by these two superpowers, following their temporary alliance and victory against Nazi Germany and Imperial Japan in 1945. Aside from the nuclear arsenal development and conventional military deployment, the struggle for dominance was expressed via indirect means such as psychological warfare, propaganda campaigns, espionage, far-reaching embargoes, rivalry at sports events, and technological competitions such as the Space Race.  





Korean War (1950–1953)

The Korean war began on June 25, 1950, when some 75,000 soldiers from the North Korean People’s Army poured across the 38th parallel, the boundary between the Soviet-backed Democratic People’s Republic of Korea to the north and the pro-Western Republic of Korea to the south. This invasion was the first military action of the Cold War. By July, American troops had entered the war on South Korea’s behalf. As far as American officials were concerned, it was a war against the forces of international communism itself. After some early back-and-forth across the 38th parallel, the fighting stalled and casualties mounted with nothing to show for them. Meanwhile, American officials worked anxiously to fashion some sort of armistice with the North Koreans. The alternative, they feared, would be a wider war with Russia and China–or even, as some warned, World War III. Finally, in July 1953, the Korean War came to an end. In all, some 5 million soldiers and civilians lost their lives in what many in the U.S. refer to as “the Forgotten War” for the lack of attention it received compared to more well-known conflicts like World War I and II and the Vietnam War. The Korean peninsula is still divided today.





Vietnam War (1965–1975)

The Vietnam War was a long, costly and divisive conflict that pitted the communist government of North Vietnam against South Vietnam and its principal ally, the United States. The conflict was intensified by the ongoing Cold War between the United States and the Soviet Union. More than 3 million people (including over 58,000 Americans) were killed in the Vietnam War, and more than half of the dead were Vietnamese civilians.  Opposition to the war in the United States bitterly divided Americans, even after President Richard Nixon signed the Paris Peace Accords and ordered the withdrawal of U.S. forces in 1973. Communist forces ended the war by seizing control of South Vietnam in 1975, and the country was unified as the Socialist Republic of Vietnam the following year.





Gulf War (1990–1991)

The Persian Gulf War, also known as Operation Desert Storm or the First Gulf War, began in 1991 after President Saddam Hussein of Iraq ordered the invasion and occupation of neighboring Kuwait in early August 1990. Alarmed by these actions, Arab powers such as Saudi Arabia and Egypt called on the United States and other Western nations to intervene. Hussein defied United Nations Security Council demands to withdraw from Kuwait by mid-January 1991, and Operation Desert Storm began with a massive U.S.-led air offensive. After 42 days of relentless attacks, U.S. President George H.W. Bush declared a cease-fire on February 28; by that time, most Iraqi forces in Kuwait had either surrendered or fled.





Bosnian War and Croatian War (1992–1995)

In April 1992, the government of the Yugoslav republic of Bosnia-Herzegovina declared its independence from Yugoslavia. Over the next several years, Bosnian Serb forces, with the backing of the Serb-dominated Yugoslav army, perpetrated atrocious crimes against Bosniak (Bosnian Muslim) and Croatian civilians, resulting in the deaths of some 100,000 people (80 percent of them Bosniak) by 1995.





War in Afghanistan (2001–2021)

The United States launched the war in Afghanistan following the September 11, 2001 terrorist attacks. The conflict lasted two decades and spanned four U.S. presidencies, becoming the longest war in American history. By August 2021, the war began to come to a close with the Taliban regaining power two weeks before the United States was set to withdraw all troops from the region. Overall, the conflict resulted in tens of thousands of deaths and a $2 trillion price tag.





Iraq War (2003–2011)

In September 1980, Iraqi forces launched a full-scale invasion of neighboring Iran, beginning the Iran-Iraq War. Fueled by territorial, religious and political disputes between the two nations, the conflict ended in an effective stalemate and a cease-fire nearly eight years later, after more than half a million soldiers and civilians had been killed.




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