Final answer:
America's foreign policy leading up to WWII was initially one of neutrality, but shifted towards active engagement as the aggressions of Germany, Japan, and Italy escalated.
Step-by-step explanation:
America's foreign policy leading up to WWII was initially one of neutrality. The United States adopted a policy of non-intervention in the conflict between Germany and its European neighbors. However, as the aggressions of Germany, Japan, and Italy continued to escalate, the US shifted towards a policy of active engagement. This change was prompted by the realization that the traditional powers in Europe were no longer capable of maintaining global stability. The US ultimately entered the war after the attack on Pearl Harbor, and played a significant role in aiding the Allies and shaping the postwar world order.