World War II began on September 1, 1939

Background: After World War I, the Treaty of Versailles was signed, imposing severe punishments on Germany which led to feelings of anger and financial difficulties.

The ascension of Adolf Hitler and the Nazi Party in Germany, along with their aggressive territorial ambitions, laid the groundwork for a worldwide conflict.

What Happened: Germany attacked Poland on September 1, 1939, marking the beginning of World War II.

Two days after Germany was declared war on by Britain and France, it marked the start of the most extensive and fatal conflict in human history.

The conflict drew in numerous countries around the world, including major world powers, leading to the creation of two opposing military alliances – the Allies and the Axis.

Future Implications: The death of millions of people due to World War II resulted in major geopolitical shifts, such as the rise of the United States and the Soviet Union as superpowers.

The conclusion of the war resulted in the establishment of the United Nations, which was designed to avert any future conflicts and laid the groundwork for the Cold War.

The conflict also led to innovations in technology, medicine, and international relations, helping to shape the modern world.