The acts of achieving peace by giving up something valuable is called
isolationism.
blitzkrieg.
fascism.
appeasement.

Appeasement.

Explanation:

Isolationism is a foreign policy of being away from the affairs or interests of other groups, especially the political affairs of other countries. This has nothing to do with achieving peace in anyway. The U.S practiced this during world war 2, only entering the war when Pearl Harbor was attacked by Imperial Japan.Blitzkrieg is a military method made prominent by the Germans in world war 2. Thus as a military strategy, it is the direct opposite of peace at best.Fascism is essentially a dictatorship, particularly one of radical, right-wing, authoritarian, and ultranationlism. Like Isolationism, as explained before, this has nothing to do with attaining peace. Germany, and italy were under fascist regimes at the time world war 2 began. Their fascist leaders being Hitler and Mussolini, Respectively.Appeasement is the decision of letting a aggressive power acquire something in the hopes of not having conflict. This is the most accurate of the answers, and if not, the perfect answer. The United Kingdom practiced this in response to Germany attacking neighboring countries. Until Britain and France declared war on Germany in September 3rd, 1939, after Germany invaded Poland.

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