Although many people warned about the threat of Nazi Germany, Chamberlain chose ministers who agreed with him, and he wanted to avoid another war. Chamberlain, like many other people of the same age, were very worried about war. They believed that people like Adolf Hitler were in power because their people felt that their situation was unfair. German people felt that the Treaty of Versailles, an agreement made to end the First World War, was unfair. When Nazi Germany invaded (took control of) Austria and the Sudetenland (part of Czechoslovakia), Chamberlain tried to keep peace.