The Second World War

The Second World War (1939–1945) was a global conflict involving most of the world's nations, divided into two main groups: the Allies (including the USA, UK, and USSR) and the Axis Powers (primarily Germany, Italy, and Japan). It was sparked by Germany's invasion of Poland and was marked by significant events like the Holocaust, the use of atomic bombs on Hiroshima and Nagasaki, and widespread battles across Europe and the Pacific. The war resulted in an estimated 70-85 million fatalities and led to major geopolitical changes, the formation of the United Nations, and the onset of the Cold War.