World War II officially began in Europe on September 1, 1939, when Germany launched its invasion of Poland. This pivotal event immediately escalated tensions across the continent, leading to a wider global conflict.
Just two days after Germany's invasion, Great Britain and France, upholding their commitment to Poland's defense, declared war on Germany on September 3, 1939. These declarations marked the formal onset of the devastating global war.
Key Events at the Outbreak of WWII
The initial days of September 1939 were critical, setting the stage for one of the most significant conflicts in human history.
| Date | Event |
|---|---|
| September 1, 1939 | Germany invades Poland |
| September 3, 1939 | Great Britain and France declare war on Germany |
The Full Duration of World War II
While the war began in 1939, it spanned several years and involved nearly every part of the world. The conflict concluded on September 2, 1945, with the formal surrender of Japan, effectively bringing an end to hostilities on all fronts.
For more comprehensive information on the conflict, its causes, and combatants, you can explore resources such as the World War II overview.
