It was true 2 centuries ago. In the age we are now where each country is interconnected at every level of a society (economy, culture, trade, innovation, research, military…) that’s not possible anymore. WW2 showed it. You can’t play head in the sand and think that everything will be fine. Since then every major economy drawbacks showed the world we live today is all interconnected and interdependent. And that’s the same for any other type of backlash or drawbacks from politics, alliances, society…