Im pretty sure as a matter of balance the US cant be represented to have as much industry as it did IRL at the time. The USA had more than 50% of the worlds industrial capacity

Not really a fair statement since that was only at the end of the war because everyone else had already been wrecked. You can still do that. At game start, it would be considerably less.

BTW, the US reached its peak relative GDP of <29% of world GDP in 1960. Although I realize you were talking about industrial capacity which is just one component of GDP, this is just for reference.

https://en.wikipedia.org/wiki/List_of_countries_by_largest_historical_GDP#United_States