Which shipyards mattered most in the Second World War?

What was the most important shipyard or group of shipyards during the Second World War?

Kaiser's yards have the strongest overall claim because Liberty ship production sustained wartime logistics, though major British combatant yards were all critical in their specialties.

A single answer depends on whether the measure is merchant tonnage, destroyers, capital ships, or some other output. Kaiser has a strong claim because mass-produced Liberty ships carried the supply system on which every theater depended. British warship construction was spread across major firms such as John Brown, Vickers, and Cammell Laird, making it harder to isolate one yard there. Merchant hull production can matter more to victory than the most famous combatant.