Arthur Neville Chamberlain FRS ( 18 March 1869 9 November 1940) was a British Conservative politician who served as Prime Minister of the United Kingdom from May 1937 to May 1940. He is best known for his foreign policy of appeasement, and in particular for his signing of the Munich Agreement on 30 September 1938, conceding the German-speaking Sudetenland region of Czechoslovakia to Germany. Following the German invasion of Poland on 1 September 1939, which marked the beginning of World War II, Chamberlain announced the declaration of war on Germany two days later and led Great Britain through the first eight months of the war until his resignation as prime minister on 10 May 1940.