The US became more isolationist after the first world war.
Explanation:
The US adopted a policy of isolation after the first world war which lasted more than a decade and this was largely due to the pact by Woodrow Wilson who even though was responsible for league of nations took no part in it.
He believed that the US needed some time to develop its own economy.
Thus they kept a reasonable distance from the countries of both side of the conflict that came in the world war and developed their own economy by their own in the time being,
