Final answer:
British Prime Minister Neville Chamberlain was the strongest supporter of appeasement, which ultimately failed in preventing the outbreak of World War II.
Explanation:
The strongest supporter of appeasement was British Prime Minister Neville Chamberlain. Chamberlain believed in trying to negotiate with Adolf Hitler to avoid conflict.
However, appeasement policies only served to embolden Hitler, leading to the invasion of Czechoslovakia and eventually sparking World War II.
This misguided belief in peaceful resolutions without considering Hitler's true intentions significantly contributed to the outbreak of the war.
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