Donald Trump says he wants to use big fees on Chinese ships to reboot US shipbuilding. Experts warn the move likely won’t work, and instead would raise prices for consumers and damage the US economy. China will produce more than half of the world’s new ships this year, compared to 5% in 2000, while the US barely makes any at all.

So how did China become so dominant, and could the US ever catch up? Or is the proposal intended as just another negotiating tactic in Trump’s global trade war?