List two causes of world war 2?

The Great Depression played a part in that every country felt the pressure as many people were without homes, food and jobs. In an effort to fight against this Hitler began to take actions that went against the Treaty of Versailles (agreement at the end of World War 1). Such examples of this include regaining an alliance with Austria/Hungary, rebuilding the army, and invading neighboring countries. With the invasion of Poland on September 1, 1939, England and Franch, who had repeatedly reminded Germany of the treaty expectations, finally declared war.