In 1913, Hitler relocated to Munich. At the outbreak of World War I, he applied to serve in the German army. He was accepted in August 1914, though he was still an Austrian citizen. Hitler became embittered over the collapse of the war effort. The experience reinforced his passionate German patriotism, and he was shocked by Germany's surrender in 1918. Like other German nationalists, he purportedly believed that the German army had been betrayed by civilian leaders and Marxists.
    In September 1919, Hitler joined the DAP, which changed its name to the Naionalsoziaistsche Deutsche Arbeitepartei (NSDAP) — often abbreviated to Nazi. He soon gained notoriety for his vitriolic speeches against the Treaty of Versailles, rival politicians, Marxists and Jews. In 1921, Hitler became the Nazi party chairman.
   Between the start of World War II, in 1939, and its end, in 1945, Nazis and their collaborators were responsible for the deaths of at least one million people, including about six million Jews, representing two-thirds of the Jewish population in Europe, to be known as the Holocaust tragedy.
   On September 1, 1939, Germany invaded Poland, sparking the beginning of World War 2. In response, Britain and France declared war on Germany two days later.
   By early 1945, Hitler realized that Germany was going to lose the war. Afraid of falling into the hands of enemy troops, Hitler and Braun (his wife) committed suicide the day after their wedding, on April 30, 1945. Hitler's political programs brought about a world war, leaving behind a devastated and impoverished. His policies inflicted human suffering on an unprecedented scale and resulted in the death of millions people.