World War I. In 1917, upon the United States' entry into World War I, the first major U.S. aviation combat force was created when an Air Service was formed as part of the American Expeditionary Force (AEF). Major General Mason Patrick commanded the Air Service of the AEF; his deputy was Brigadier General Billy Mitchell.These aviation units, some of which were trained in France, …

The history of the United States from 1918 through 1945 covers the post-World War I era, the Great Depression, and World War II.After World War I, the U.S. rejected the Treaty of Versailles and did not join the League of Nations.. In 1920, the manufacture, sale, import and export of alcohol was prohibited by an amendment to the United States Constitution.

1918–1945 World War I ... Political machines appeared early in the history of the United States, and for all the exhortations of Jacksonian Democracy, it was they and not the average voter that nominated candidates. In addition, the system supported establishment politicians and party loyalists, and much of the legislation was designed to ...

The history of immigration to the United States details the movement of people to the United States, from the colonial era to the present.The United States experienced successive waves of immigration, particularly from Europe, and later from Asia and Latin America. Colonial era immigrants often repaid the cost of transoceanic transportation by becoming indentured …

The United States declared war on the German Empire on April 6, 1917, nearly three years after World War I started. A ceasefire and Armistice was declared on November 11, 1918.Before entering the war, the U.S. had remained neutral, though it had been an important supplier to the United Kingdom, France, and the other powers of the Allies of World War I.

The 11th Airborne Division ("Arctic Angels") is a United States Army airborne formation, first activated on 25 February 1943, during World War II.Consisting of one parachute and two glider infantry regiments, with supporting troops, the division underwent rigorous training throughout 1943. It played a vital role in the successful Knollwood Maneuver, which was organized to …

Lengths of U.S. combat forces' participation in wars. War in the context of this list is broadly construed to be a direct armed conflict between organized U.S. military forces and organized forces of (a) belligerent(s). (Note: Ongoing wars are indicated in bold and with red bars.)

The history of the United States from 2008 to the present began with the collapse of the housing bubble, which led to the Great Recession.The resulting economic downturn and general discontent led Barack Obama to win the presidential election in 2008, becoming the country's first African-American president. Obama's domestic agenda notably included economic stimulus …

World War II was the deadliest military conflict in history.An estimated total of 70–85 million people perished, or about 3% of the 2.3 billion (est.) people on Earth in 1940. Deaths directly caused by the war (including military and civilian fatalities) are estimated at 50–56 million, with an additional estimated 19–28 million deaths from war-related disease and famine.

The 1920 United States presidential election was the 34th quadrennial presidential election, held on Tuesday, November 2, 1920.In the first election held after the end of World War I and the first election after the ratification of the Nineteenth Amendment, Republican Senator Warren G. Harding of Ohio defeated Democratic Governor James M. Cox of Ohio. ...