The limits of American isolationism after World War I

What happens if the United States returns to isolationism after World War I?

In this interpretation, complete withdrawal would entail changes to overseas possessions, trade, and international influence, extending beyond a decision to avoid another war.

The interpretation here presents American policy as moving repeatedly between international engagement and withdrawal. Support for creating the League of Nations and the subsequent refusal to join illustrate that domestic division. Avoiding another war provides a rationale for withdrawal, but complete isolation would also affect the Philippines and other overseas commitments. Trade and expectations of influence would have to change with them. The counterfactual therefore tests how far withdrawal could proceed while the United States continued acting as a world power.