This document provides an overview of world history from World War II to modern challenges. It covers major events like the Cold War rivalry between the US and USSR, wars in Korea and Vietnam, decolonization in India and the creation of Israel, the Iranian revolution, and modern issues like terrorism and conflicts in the Middle East. Key topics reviewed include the causes and sides in WWII, the Holocaust, postwar divisions in Europe, US foreign policy responses to the spread of communism, and massacres in Cambodia, Rwanda, and the Balkans. New technologies, human rights reforms, and increased terrorism are also summarized as modern challenges.