The Munich Pact (Munich Agreement) was signed in September 1938 by Germany, Britain, France, and Italy. It allowed Germany to annex the Sudetenland region of Czechoslovakia, representing the height of the appeasement policy. The other options are incorrect: the Soviet-Nazi Non-aggression Pact was 1939, Lend-Lease was 1941, and the Manhattan Project was the WWII atomic bomb program.