Which would be relevant if the US wasn't dominant before WW2. But it was. Ironically, the end of WW2 actually hurt US shipbuilding because there was a huge glu

Which would be relevant if the US wasn't dominant before WW2. But it was. 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.