Locarno paved the way for Germany's admission to the League of Nations in 1926. Nazi era, 1933–1939 Hitler came to power in January 1933, and inaugurated an aggressive power designed to give Germany economic and political domination across central Europe. He did not attempt to recover the lost colonies. Until August 1939, the Nazis denounced Communists and the Soviet Union as the greatest enemy, along with the Jews. Hitler's diplomatic strategy in the 1930s was to make seemingly reasonable demands, threatening war if they were not met. When opponents tried to appease him, he accepted the gains that were offered, then went to the next target. That aggressive strategy worked as Germany pulled out of the League of Nations, rejected the Versailles Treaty, and began to rearm. Retaking the Territory of the Saar Basin in the aftermath of a plebiscite that favoured returning to Germany, Hitler's Germany remilitarised the Rhineland, formed the Pact of Steel alliance with Mussolini's Italy, and sent massive military aid to Franco in the Spanish Civil War. Germany seized Austria, considered to be a German state, in 1938, and took over Czechoslovakia after the Munich Agreement with Britain and France. Forming a non-aggression pact with the Soviet Union in August 1939, Germany invaded Poland after Poland's refusal to cede the Free City of Danzig in September 1939. Britain and France declared war and World War II began – somewhat sooner than the Nazis expected or were ready for. After establishing the "Rome-Berlin Axis" with Benito Mussolini, and signing the Anti-Comintern Pact with Japan – which was joined by Italy a year later in 1937 – Hitler felt able to take the offensive in foreign policy. On 12 March 1938, German troops marched into Austria, where an attempted Nazi coup had been unsuccessful in 1934. When Austrian-born Hitler entered Vienna, he was greeted by loud cheers. Four weeks later, 99% of Austrians voted in favour of the annexation (Anschluss) of their country Austria to the German Reich. After Austria, Hitler turned to Czechoslovakia, where the 3.5 million-strong Sudeten German minority was demanding equal rights and self-government. At the Munich Conference of September 1938, Hitler, the Italian leader Benito Mussolini, British Prime Minister Neville Chamberlain, and French Prime Minister Édouard Daladier agreed upon the cession of Sudeten territory to the German Reich by Czechoslovakia. Hitler thereupon declared that all of German Reich's territorial claims had been fulfilled. However,