Final answer:
Appeasement policy by Western democratic governments prior to World War II inadvertently encouraged Hitler's aggression, leading to the outbreak of the war.
Explanation:
Appeasement was the policy of making concessions to the aggressor powers in order to avoid conflict, which was predominantly adopted by Western democratic governments towards Nazi Germany before World War II.
This policy inadvertently encouraged Hitler's aggression by signaling a lack of resistance and emboldening his expansionist goals.
The failure of appeasement led to the outbreak of World War II as it allowed Hitler to annex neighboring territories without facing significant opposition.
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