How would you characterize American foreign policy in the 1920s and 1930s?

I would say
that American foreign policy in the 1920s was rather different from that of the 1930s.  In the
1920s, the US undertook diplomatic endeavors that were meant to make another war impossible or
unlikely.  In the 1930s, the US largely gave up on this approach and turned to
isolationism.

In the 1920s, the US tried to use diplomacy to reduce the
chance of another major war happening.   The two main undertakings that are associated with this
effort are the Kellogg-Briand Pact of 1928 and the Washington Naval Conference of 1921-22.  At
the naval conference, the US and other nations set limits on...

href="https://history.state.gov/milestones/1921-1936/naval-conference">https://history.state.gov/milestones/1921-1936/naval-conf...
href="https://history.state.gov/milestones/1921-1936/neutrality-acts">https://history.state.gov/milestones/1921-1936/neutrality...