Answer:
Appeasement
Step-by-step explanation:
The approach Europe took when Hitler showed aggression to the Czech and Polish people is called APPEASEMENT
Appeasement is a political term used to describe the diplomatic methods used in international relations to ensure political or material settlements between parties or countries involved to avoid unnecessary confrontations, particularly from the aggressive power or government.
Hence, in this case, to settle conflicts with Germany (the aggressive power), Europe used the APPEASEMENT approach to relate with Hitler when he showed aggression to the Czech and Polish people.