Earlier quoted context omitted.
This is a false narrative. US shipbuilding did not rest on its laurels because of the jones act. The Jones Act was passed in the 1920s; US shipbuilding rose to a dominant position while it was in place. The US lost that position only after the 1980s cessation of subsidies to domestic shipbuilders. Ironically this was a move to stop foreign nations from subsidizing their shipbuilding industries, but it was never recip…
> US shipbuilding rose to a dominant position while it was in place. You seem to be omitting the fact that the US sank pretty much every non-allied boat in the ocean during WWII and bombed every shipyard outside of England. That created a MASSIVE advantage.
Ironically, the end of WW2 actually hurt US shipbuilding because there was a huge glut of surplus ships on the market and for a brief time a massive drop in trade. British ship builders actually took the title of world's largest shipbuilder back after WW2, producing nearly half of all tonnage in the next decade as Europe rebuilt its merchant fleets.
The countries that had their shipyards destroyed in the war built new shipyards with better technology. They took the lead after that, Japan obviously being the biggest winner in the late 20th century.