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This is an incredibly scary (and naive) proposition.
If the next President is an isolationist then we might as well say goodbye to America as we know it. Suggesting that the next President should focus solely on America is scary as hell. There are seven billion people in this world and we have binding international agreements with the vast majority countries these seven billion people live in.
As Thomas Friedman wrote--the world is flat. Countries can no longer be isolationists because we are all interconnected in ways that will never be able to be unwound.
The vast (and I mean vast) majority of products that Americans wear, watch, and use are made in other countries. You are lying to yourself if you honestly believe that the next President would be able to use king like powers and mandate that all those products are made in America.
And let's say that the next President does use those king like powers--what happens when every American finds out that those jeans they used to be able to buy for $20 are now $200. That television they used to be able to buy for $500 is now $5,000. And that car they used to be able to buy for $25,000 is now $250,000. That's what would happen if we walked away from the international stage. It would usher in a great depression unlike anything this country has ever seen.