As I mentioned, on September 30, 1938, Hitler, Mussolini, French Premier Daladier, and British Prime Minister Chamberlain signed the Munich Pact, which sealed the fate of Czechoslovakia giving to Germany the Sudentenland, the Czechoslovakian part where 3 million ethnic Germans lived, where it was 66 percent of Czechoslovakia’s coal, 70 percent of its iron and steel, and 70 percent of its electrical power. Without those resources, the Czech nation was left vulnerable to complete German domination.
Under this German pressure, the Slovaks declare their independence and formed a Slovak Republic. The Germans still violated the Munich Agreement and invaded the Czech lands that weren't in the agreement, forming a Protectorate of Bohemia and Moravia.
Hitler would still get a free passageway from Czech lands to control the fronts and ultimately would dominate Slovakia, but that's another story.
