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The League of Nations was the first worldwide intergovernmental organization whose principal mission was to maintain world peace. -
On August 18, 1920 women were given the right to vote after many years of fighting. -
The Indian Citizenship Act of 1924, also known as the Snyder Act, was an Act of the United States Congress that granted US citizenship to the indigenous peoples of the United States, called "Indians" in the Act. -
The Great Mississippi Flood of 1927 was the most destructive river flood in the history of the United States, with 27,000 square miles inundated in depths of up to 30 feet. -
Amelia Mary Earhart was an American aviation pioneer and author. Earhart was the first female aviator to fly solo across the Atlantic Ocean. She set many other records, wrote best-selling books about her flying experiences. -
The national anthem is also called the star-spangled banner and it was approved on March 31, 1931 -
In the 1932 presidential election, Roosevelt defeated Republican incumbent Herbert Hoover in a landslide. Roosevelt took office in the midst of the Great Depression, the worst economic crisis in U.S. history. -
In 1933, the 21st Amendment to the Constitution was passed and ratified, ending national Prohibition. After the repeal of the 18th Amendment, some states continued Prohibition by maintaining statewide temperance laws. -
The Social Security Act of 1935 is a law enacted by the 74th United States Congress and signed into law by US President Franklin D. Roosevelt. -
World War II began in Europe on September 1, 1939, when Germany invaded Poland. ... The war in the Pacific began on December 7/8, 1941, when Japan attacked the American naval base at Pearl Harbor and other American, Dutch, and British military installations throughout Asia. -
The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States against the naval base at Pearl Harbor in Honolulu, Territory of Hawaii, just before 08:00, on Sunday morning, December 7, 1941. -
The Normandy landings were the landing operations and associated airborne operations on Tuesday, 6 June 1944 of the Allied invasion of Normandy in Operation Overlord during World War II. Codenamed Operation Neptune and often referred to as D-Day, it was the largest seaborne invasion in history. -
Roosevelt won reelection in 1944, but with his physical health declining during the war years, he died in April 1945, less than three months into his fourth term. The Axis Powers surrendered to the Allies in the months following Roosevelt's death, during the presidency of his successor, Harry S. Truman. -
The United Nations is an intergovernmental organization aiming to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a center for harmonizing the actions of nations. -
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.