Joining the United Nations and participating in NATO represented a shift in U.S. foreign policy from isolationism to being more active in the international scene.
<h3>How did U.S. foreign policy change after WWII?</h3>
The U.S. decided to abandon its isolationist policies and engage in international affairs as a result of its status as a superpower.
It showed this shift by joining the United Nations as well as participating in NATO to protect her allies.
