What changed in the US government after World War One?

After World War I, the US government did not anymore interfere that much with the affairs of the European countries like it did before the World War and during it. It concentrated more on its own internal affairs. When former president Harding was elected during the presidential elections, this all became possible. The people had more access to technological enhancements. Workers also had higher salaries. The US government as a whole concentrated on making America a better nation than poking at the affairs of other countries.