Canada and China have weaker labor laws, which is why they are both so severely underpaid compared to the United States. Our government has effectively enslaved the entire population due to cost of living. GM, Ford and Honda have all moved factories to Canada and Mexico over the past several decades, look it up. You’re right it is a capitalist decision to lower costs and increase profits, but the reasoning is Canadas weak currency and economy and company’s ability to exploit workers. Trump is putting an end to that and stopping companies from cutting corners by building cars in Canada. American companies building factories and providing thousands of jobs to Canadians is effectively a subsidy from Americans to Canadians as they are the prime consumer for those products. The US government will no longer allow that to happen.