World tensions were rising in the late 1930s as several dictators sought to expand their territory. Joseph Stalin had consolidated power in the Soviet Union and established a brutal communist regime. In Italy, Benito Mussolini rose to power on a nationalist platform of fascism. In Germany, Adolf Hitler gained control of the Nazi party and dreamed of creating a greater German empire while pursuing racist policies. Japan also took steps to expand its territory. Hitler annexed Austria and parts of Czechoslovakia through aggression and appeasement by Western nations. In 1939, Hitler signed a non-aggression pact with Stalin and invaded Poland, starting World War II in Europe.