Germany faced many economic and social hardships after World War 1 due to losing territory and resources, millions of casualties, and restrictions from the Treaty of Versailles. Adolf Hitler rose to power by promising to restore Germany's economy and military strength, gaining control of the government as Chancellor in 1933. Under Hitler, Germany rapidly rebuilt its military, violated the Treaty by occupying neighboring lands, and plunged the world into World War 2 by invading Poland in 1939.