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- In 1938, Chamberlain agreed to the Munich Agreement, which allowed Germany to occupy the Sudetenland, the German-speaking part of Czechoslovakia.
- In March 1939, Hitler’s forces seized the rest of Czechoslovakia, defying his promises at Munich.
- Chamberlain then decided to resist further German aggression.
- In September 1939, Germany invaded Poland, starting World War II.
- Chamberlain had made an agreement with the Poles to defend them if Germany invaded.
- Hitler thought Britain would not go to war over Poland, and sent his soldiers into Poland.
- Two days later, Britain declared war on Germany.
