We aren't on our own anymore. We live and participate in a global economy, and if we want to import goods, we're going to have to accept that somebody is going to import something from us, generally referring to manufacturing jobs. Would the economy be better if we could put even the lowest skilled of people to work here creating what we would normally pay others to make for us, especially since we'd be keeping wealth within the country. But just because we don't do that doesn't mean that the American economy is in peril. It just means it's changing.
tl;dr reducing costs