The document summarizes key events and effects of major 20th century conflicts and human rights issues: World War I was caused by militarism, alliances, imperialism, and nationalism, and led to the Treaty of Versailles, depression, and WWII. World War II was caused by fascism in Germany and Italy and Japan's imperialism, and led to the UN, Nuremberg trials, creation of Israel, and Cold War divisions. The Cold War was caused by competing ideologies following WWII and ended with the collapse of the Soviet Union. Major human rights issues discussed include the Ukrainian famine under Stalin, apartheid in South Africa ended by Mandela, the Rwandan genocide, killings in Cambodia and Myanmar