Answer:
Appeasement was a policy adopted by European powers towards Hitler's actions in the 1930s, which involved giving in to his demands in an attempt to avoid war. The policy was motivated by the fear of another world war, given the devastation caused by World War I, and the belief that Hitler's demands were reasonable and could be satisfied without the need for military action.
One example of appeasement was the Munich Agreement of 1938, in which France and Great Britain agreed to let Germany annex the Sudetenland region of Czechoslovakia, with the hope that this would satisfy Hitler's territorial ambitions and prevent war. Another example was the Anschluss of Austria, in which Germany annexed Austria in 1938 without any significant opposition from other European powers.
The response of the leaders from France and Great Britain at the time was to adopt a policy of appeasement towards Hitler's aggressive actions. The French leader, Édouard Daladier, and the British Prime Minister, Neville Chamberlain, believed that appeasement would prevent another devastating war and that Hitler's territorial demands were reasonable.
However, this policy of appeasement ultimately failed, as Hitler continued to expand his territory and increase his military power. The invasion of Poland in 1939 finally led to the outbreak of World War II.
In hindsight, the world should have reacted differently to Hitler's actions in the 1930s. Instead of appeasement, a more firm and united response from European powers, particularly France and Great Britain, could have deterred Hitler and prevented the outbreak of war. For instance, economic sanctions or a military alliance could have been formed to counter Hitler's aggression. The lack of a strong and united response allowed Hitler to pursue his ambitions and ultimately led to the devastation of World War II.