Final answer:
Adolf Hitler forced Austria and Germany to unite in 1938, known as the Anschluss.
Step-by-step explanation:
In 1938, Adolf Hitler forced Austria and Germany to unite. This event is known as the Anschluss. Hitler used Nazi propaganda to gain support in Austria and then orchestrated the union by infiltrating the Austrian cabinet and sending the German army to preserve order. The annexation of Austria was favored by some Austrians but opposed by others who were silenced by Hitler's actions.