Indeed, it depends on how "America" is defined since the culture plainly has had different sides that have been exposed over the course of its history.

Fareed Zakaria's recent special on "America First" shows the history of Trumpian isolationism going back to the Founding Fathers and WWII. But it's a question of reading the trendlines. Republicans themselves under Reagan and Eisenhower put down the isolationist wing of their party. Trump's resurrecting it, as Pat Buchanan had tried to do.

https://www.politico.com/magazine/story/2018/07/13/gop-isolationism-trump-eisenhower-219003/