Final answer:
Hitler's annexation of Austria was facilitated by the support from Austrian nationals and the lack of resistance from European countries practicing appeasement, allowing him to absorb Austria without significant opposition.
Step-by-step explanation:
Two reasons why it was easy for Hitler to annex Austria include the support of the Austrian public who were influenced by Nazi propaganda and the desire for unification with Germany, and the lack of resistance from other European nations due to the policy of appeasement. The Anschluss, or union, was facilitated by the infiltration of Austrian politics by Nazis, as Hitler had previously positioned them in key posts within the government. Furthermore, when the Austrian leader resisted Hitler's further demands, the German army was sent into Austria under the pretense of preserving order, which discouraged opposition internally. Externally, the muted response from nations like Great Britain and France, who merely protested without taking any substantial action, gave Hitler the confidence to proceed without fear of immediate retaliation.