During WWII there were 3 Navy Shipyards and two civilian ship yards capable of building 100 or so large aircraft carriers, battleships and heavy cruisers. Today only one civilian yard has that capability. During WWII probably a dozen different shipyards built hundreds of light cruisers, destroyers and destroyer escorts. Today there are two or three yards that can do that. During WWII there were dozens of shipyards building thousands of cargo ships. Today only two or three build cargo ships in this country. To answer your question, we really do not have much ship construction capability anymore.
Interesting thing about shipbuilding is that the 3 biggest commercial shipbuilding nations (S.Korea, Japan and China) have a huge lead over their nearest rivals. The US is nowhere near them.