World War I: Impact and Legacy

Russia suffered the most casualties during World War I, with an estimated 1.7 million soldiers killed and 4.9 million wounded.

The Treaty of Versailles was the main peace treaty that ended World War I. It was signed on June 28, 1919, between the Allied Powers and Germany.

The United Kingdom gained the most territory as a result of World War I, acquiring control over former German colonies in Africa, the Middle East, and the Pacific.

The League of Nations was an international organization that was created after World War I to promote peace and cooperation. It was founded on January 10, 1920, and was headquartered in Geneva, Switzerland.

The United States was the first country to withdraw from the League of Nations. It did so in 1920, after the U.S. Senate refused to ratify the Treaty of Versailles.

The Great Depression was an economic crisis that occurred in the 1930s, which was partly caused by the aftermath of World War I. It began in the United States in 1929 and spread to other countries around the world.