Idly browsing through grognard Youtube I came across this neat little video showcasing the difference in economic strength between Japan and the US by just listing every ship build by either country from December 7, 1941.
The Japanese leadership was well aware of this discrepancy in strength of course; admiral Yamamoto, architect of the attack on Pearl Harbour had said he could only guarantee success for six months to a year. The idea had always been to deal a crippling blow to the US navy in the Pacific, then consolidate and go on the defence, hoping to wear down the US to a negotiated peace. That obviously didn’t work and the overwhelming superiority of the US ship building industry is one reason.