The Rust Belt's just one part of the story, not the whole US economy. Globalization actually created tons of wealth for the USA, but that money hasn't been spread around fairly. It's all piled up in coastal cities and with rich folks while factory towns got left behind. Cutting off global trade wouldn't fix anything - it would tank the overall economy while only helping a few powerful players pulling the strings. The real problem isn't trade deals; it's that the USA never properly invested the profits back into the communities that got hit hardest.