After the armistice was signed ending World War I, the U.S. actually retreated into isolation. However, they still pursued foreign affairs in a very limited manner.
Despite Wilson’s promise to keep the U.S. out of all foreign wars, he pushed for congress to declare war on Germany and U.S. entry into World War I. Soon after, Americans began to regret their decision after the peace treaty was signed isolationist tendencies began to arise. Congress rejected the treaty, refusing to join the League of Nations. Many Americans felt they didn’t need the rest of the world and they could make their own decisions. Some Americans remained involved in the league, but did no more than observe.
There are few examples of the U.S. involving itself in foreign affairs. The Kellogg-Brand Act was one such example, although it was flawed in its reasoning and execution.
When the Great Depression struck in 1929, the U.S. went into a different type of isolation. Like many other western economies, the U.S. was concentrating on fixing its economy while fascist regimes gained power.