World War II was a global conflict that lasted from 1939 to 1945, involving most of the world's nations. The war began in Europe when Germany, under the leadership of Adolf Hitler, invaded Poland on September 1, 1939. This act of aggression prompted the United Kingdom and France to declare war on Germany, marking the beginning of a devastating conflict that would claim millions of lives.
The causes of World War II are complex and multifaceted. The Treaty of Versailles, which ended World War I, imposed harsh penalties on Germany, leading to widespread resentment and economic hardship. This created an environment in which extremist ideologies like Nazism could flourish.
The early years of World War II saw Germany's rapid expansion across Europe, with the invasion of Denmark, Norway, Belgium, the Netherlands, and France. The Battle of Britain was a pivotal moment in the war, as it prevented Germany from gaining air superiority over the UK.
The Eastern Front saw brutal fighting between German forces and the Soviet Union, resulting in massive losses on both sides. The Battle of Stalingrad was a turning point in the war, marking a decisive defeat for Germany.
World War II was marked by unprecedented humanitarian crises, including the Holocaust, in which six million Jews were systematically murdered by the Nazi regime. The war also led to widespread destruction, displacement, and famine.
The war had far-reaching global consequences, including the rise of the United States as a superpower and the devastation of many European cities.