The term "Anschluss" refers to the annexation of Austria into Nazi Germany in March 1938. This event was marked by a political union that was largely supported by many Austrians who favored unification with Germany. The annexation was achieved without military conflict, as German troops entered Austria and were welcomed by the population. The Anschluss was significant as it represented a key step in Adolf Hitler's expansionist policies and the lead-up to World War II. It violated the Treaty of Versailles, which had prohibited the unification of Germany and Austria. The event heightened tensions in Europe and set a precedent for further aggression by Nazi Germany.