Some major historical world events that occurred in the 20th century include World War I, World War II and the Great Depression. All three events affected countries across the globe and helped shape future events of the century.
World War I lasted from 1914 until 1919. This global conflict involved a number of world powers, including Germany, England, France, the Ottoman Empire, the United States and Russia. The war concluded with the formation of the League of Nations.
World War II lasted from 1939 until 1945 and saw Germany, Italy and Japan in conflict against an allied power that included England, the United States and the Soviet Union. Following the war's conclusion, tensions between the world's two superpowers, the United States and the Union of Soviet Socialist Republics, rose.
The Great Depression started in 1929 with the fall of the U.S. stock market and ended in the early 1940s. This economic crisis closed banks worldwide.