Total war during World War II involved the complete mobilization of resources and people, blurring the lines between civilian and military targets.

The Treaty of Versailles was signed to formally end World War I and imposed heavy reparations and territorial losses on Germany.

The assassination of Archduke Franz Ferdinand of Austria-Hungary in June 1914 is widely regarded as the immediate catalyst that triggered World War I.

The Cold War was characterized by the ideological struggle between capitalism, led by the United States, and communism, led by the Soviet Union.

The Marshall Plan was an American initiative to provide aid to Western Europe to help rebuild economies after the devastation of World War II.

The Battle of Midway, fought in June 1942, is considered a turning point in the Pacific Theater as it significantly weakened the Japanese fleet.

The invasion of Poland by Germany on September 1, 1939, is widely considered the event that marked the beginning of World War II.

The unconditional surrender of Germany on May 7, 1945, marked the end of World War II in Europe.

The Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S., was a significant factor in the U.S. decision to enter World War I.

World War II led to the emergence of the United States and the Soviet Union as superpowers, resulting in the Cold War, a period of geopolitical tension.