America literally delayed joining both world wars because of how strong the desire not to be involved with other countries was.

Do you imagine that people in the US aren't familiar with the concept? We've been debating it since the time of Teddy Roosevelt.

you're completely wrong, (intelligent) Americans are completely aware of the concept and more-or-less think in those terms regularly.

You won't find the term in speeches but that's because in America speeches are essentially slop. Or at least, they are basically not written as a dialogue with well-informed/intelligent people.