Fill in the Blanks HITLER/3Online version Hitler biography. by Alfonso Poza 1 speeches returned intelligence Workers' Versailles chairman swastika join Semitic appeal After World War I , Hitler to Munich and continued to work for the military as an officer . While monitoring the activities of the German Party ( DAP ) , Hitler adopted many of the anti - , nationalist and anti - Marxist ideas of DAP founder Anton Drexler . Drexler invited Hitler to the DAP , which he did in 1919 . To increase its , the DAP changed its name to the Nationalsozialistische Deutsche Arbeiterpartei ( NSDAP ) . Hitler personally designed the party banner , featuring a in a white circle on a red background . Hitler soon gained notoriety for his against the Treaty of , rival politicians , Marxists and Jews . In 1921 , Hitler replaced Drexler as NSDAP party .