It originated as Decoration Day in May 1868, an annual commemoration in which the graves of the war dead were decorated with flowers.
At the time, Maj. Gen. John A. Logan, who served in the Mexican-American War and the Civil War, declared that Decoration Day should be observed in May because flowers would be in bloom all across the country.
As decades passed, it became known as Memorial Day, and in 1971 a federal law took effect declaring Memorial Day a national holiday to be held on the last Monday of May, observing all military personnel who have died in American wars.
On April 19, 1775, the first engagement of the war between the colonies and Britain erupted in Massachusetts, long a hotbed of rebellion, with the battles of Lexington and Concord. Two months later, the Second Continental Congress representing the 13 colonies tasked George Washington to be commander of the Continental Army. In 1789 he became the first president of the United States.
War of 1812 (1812-1815)
The causes were complex, but at its core, the war was about Britain preventing the United States from trading with foreign countries. Also, Britain did not want the young United States to move into western territories, so it provided weapons to Native Americans on the British side. On June 18, 1812, President James Madison signed the declaration of war for the conflict now best remembered for the sacking of Washington, D.C., and for inspiring Francis Scott Key to write “The Star-Spangled Banner.”
Indian Wars (approximately 1817-1898)
European settlers and Native Americans had battled each other long before the United States was founded, but those conflicts took on new urgency as the country expanded westward in the 1800s. The native populations were massacred, driven from their lands and compelled to give up their language and culture. The total dead is an estimate by the Department of Veterans Affairs.
Mexican-American War (1846-1848)
The war was the first U.S. conflict fought primarily on foreign soil and carried out the expansionist vision of President James K. Polk. In the end, Mexico lost large portions of its territory, which today include all or parts of Arizona, California, New Mexico, Nevada and Utah. The war also served as a training ground for many soldiers — including Robert E. Lee and Ulysses S. Grant — who would fight against each other in the Civil War.
Civil War (1861-1865)
The tally of battlefield deaths, awful as it is, offers only a glimpse of the suffering and sacrifice during the war that put down the rebellion of 11 Confederate states and ended slavery. Thousands of soldiers, from both North and South, died from disease or other causes. Among Union forces, there were 224,097 deaths in theater but not in battle. For the Confederacy, the total was 59,297.
Spanish-American War (1898)
The war resulted from conflicts between Spain and the United States and, eventually, ended colonial rule by Spaniards in the Americas. The war also extended the United States’ global reach with the acquisition of territories in Latin America and the Pacific. The war would long be remembered for the cry, “Remember the Maine!” — after a U.S. naval ship that exploded in Havana Harbor — and for the attack on San Juan Hill in Cuba that included future President Theodore Roosevelt.
World War I (1917-1918)
After remaining neutral in the war for almost three years, the United States entered on April 6, 1917. At the time, many Americans shared the view of President Woodrow Wilson and were reluctant to enter the war. But, citing increasing German aggression, Wilson asked Congress to approve a declaration of war to enter “the war to end all wars.”
World War II (1941 –1945)
For two years, the United States remained neutral in the war until Japan’s surprise attack on Pearl Harbor on Dec. 7, 1941. Within days the U.S. was at war as well with the other Axis powers, Germany and Italy. It would become America’s bloodiest war. A total of 670,846 service members suffered nonmortal wounds.
Korean War (1950-1953)
In June 1950, communist North Korea initiated a surprise attack on South Korea. The United States and other nations came to the South’s aid in what President Harry S. Truman called a “police action.” The war was seen as key to preventing the spread of communism. Though an armistice was signed to halt hostilities, a peace treaty to formally end the war never was.
Vietnam War (1964-1975)
In an effort to prevent communist North Vietnam from taking over South Vietnam, the United States deployed nearly 3.4 million troops to Southeast Asia. The war, America’s longest up to that time, forever changed American politics and culture as public opinion turned against the conflict. In addition to those killed in battle, there were 10,786 deaths in theater.
Persian Gulf War (Desert Shield/Desert Storm) (1990-1991)
On Jan. 16, 1991, President George H.W. Bush announced the operation intended to oust occupying Iraqi forces from Kuwait, which Iraq had invaded and annexed months earlier. Iraqi forces were quickly overwhelmed by American firepower.
Global War on Terrorism (2001 to present )
Shortly after the Sept. 11, 2001, terrorist attacks, President George W. Bush launched what has become known as the “war on terror.” This led to military action in Afghanistan and the second invasion of Iraq, which ultimately toppled dictator Saddam Hussein. To this day, American troops are fighting against extremist groups in Iraq and Afghanistan. The cumulative death total figures are according to icasualties.org, a website dedicated to keeping detailed documents of fallen service members fighting in Iraq and Afghanistan.