You can produce everything here. But you can buy a lot of things cheaper overseas. Why produce bananas that will cost about $2 apiece in Florida if you can buy them at 20 cents a pound from Costa Rica?
It's a question of whether you want a high standard of living or a low one. Personally, I want a high one. I think we're doing a pretty good job of accomplishing that with our current trade policy. If we ban imports, you can expect your standard of living to go down.
True, and the partial ban on imports otherwise know as tariffs are causing a partial reduction in your standard of living already.