Hitler rose to power in Germany in 1933 and sought to undo the Treaty of Versailles, expand German territory, and destroy communism. Over the next several years, he took incremental steps to rearm Germany and annex neighboring lands, including remilitarizing the Rhineland in 1936, annexing Austria in 1938, and taking the Sudetenland from Czechoslovakia later that year. In 1939, Hitler signed a non-aggression pact with Stalin and invaded Poland, prompting Britain and France to declare war on Germany, plunging Europe into World War II.