After WWII, the industrial base of many countries were decimated. The US didn't thrive because we made everything. The U.S. thrived because we had no competition. If you look at a chart of per capita incomes, the U.S. is higher than most countries that you would want to compare us to. We've been the chief beneficiaries of the global order that is now under stress. It's a massive mistake to think that turning into hermits will make us wealthier. The UK tried that with Brexit and it's been a disaster for them.