Nazi Germany
Military build-up

As early as February 1933, Hitler announced that rearmament must begin, albeit clandestinely at first, as to do so was in violation of the Versailles Treaty. On 17 May 1933, Hitler gave a speech before the Reichstag outlining his desire for world peace and accepted an offer from American President Franklin D. Roosevelt for military disarmament, provided the other nations of Europe did the same. When the other European powers failed to accept this offer, Hitler pulled Germany out of the World Disarmament Conference and the League of Nations in October, claiming its disarmament clauses were unfair if they applied only to Germany. In a referendum held in November, 95 per cent of voters supported Germany's withdrawal.

In 1934, Hitler told his military leaders that rearmament needed to be complete by 1942, as by then the German people would require more living space and resources, so Germany would have to start a war of conquest to obtain more territory. The Saarland, which had been placed under League of Nations supervision for 15 years at the end of World War I, voted in January 1935 to become part of Germany. In March 1935, Hitler announced the creation of an air force, and that the Reichswehr would be increased to 550,000 men. Britain agreed to Germany building a naval fleet with the signing of the Anglo-German Naval Agreement on 18 June 1935.

When the Italian invasion of Ethiopia led to only mild protests by the British and French governments, on 7 March 1936 Hitler used the Franco-Soviet Treaty of Mutual Assistance as a pretext to order the army to march 3,000 troops into the demilitarised zone in the Rhineland in violation of the Versailles Treaty. As the territory was part of Germany, the British and French governments did not feel that attempting to enforce the treaty was worth the risk of war. In the one-party election held on 29 March, the Nazis received 98.9 per cent support. In 1936, Hitler signed an Anti-Comintern Pact with Japan and a non-aggression agreement with Mussolini, who was soon referring to a "Rome-Berlin Axis".

Hitler sent military supplies and assistance to the Nationalist forces of General Francisco Franco in the Spanish Civil War, which began in July 1936. The German Condor Legion included a range of aircraft and their crews, as well as a tank contingent. The aircraft of the Legion destroyed the city of Guernica in 1937. The Nationalists were victorious in 1939 and became an informal ally of Nazi Germany.
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