Final answer:
The feeling among Americans that the U.S. should not get entangled in foreign affairs or foreign conflicts and instead focus primarily on what is happening within its own borders is referred to as isolationism.
Step-by-step explanation:
The feeling among Americans that the U.S. should not get entangled in foreign affairs or foreign conflicts and instead focus primarily on what is happening within its own borders is referred to as isolationism. Isolationism is a foreign policy approach characterized by a desire to return to a practice of avoiding involvement in world affairs and maintaining a non-interventionist stance. Throughout American history, there have been periods of isolationism, such as during the late 18th century and early 20th century, where the United States aimed to stay out of foreign entanglements and focus on domestic matters.