After World War I the United States of America developed an isolation policy. As a result, the US stayed did not involved in the events in Europe and Asia that would soon lead to World War II. In Europe and Asia there was a lot of tension. Adolf Hitler, the chancellor of Germany, Joseph Stalin, the leader of the Soviet Union, and Benito Mussolini, the prime minister of Italy all formed totalitarianism states. Germany under Hitler's power expanded by taking over Rhineland. Additionally Francisco Franco was leading a revolution in Spain. Lastly many of the allies were not paying debts from World War I. All this tension eventually lead to World War II. Several events led to up the beginning of the Second World War starting when Germany took over Austria and Sudetenland in 1938. France and England made an agreement with Germany, the Munich Pact. This pact meant that Germany could not expand, but they could keep Sudetenland. Later on, The Rome-Berlin Axis was formed by Hitler and Mussolini. This was a military alliance that lasted for 10 years. Japan later entered the alliance. In 1939 Poland was invaded by Hitler’s Nazi regime. This broke the Munich Pact, so France and England declared war on Germany in September 1939. Germany, under Hitler, continued its expansion by taking over Denmark, Norway, Holland, and Belgium. By the time France fell to Germany in June 1940 the US became increasingly nervous of Hitler’s power. The US began to build a strong army. The US and Great Britain then formed the Lend Lease Act in 1941. This act allowed the US to lend military items that Great Britain needed, in war. The US finally ended it isolationist position when Japan bombed Pearl Harbor on December 7, 1941, where 2,000 people were killed. The U.S. declared war on Japan and, in turn, Germany and Italy, allies of Japan, declared was on the United States.