We'd lose a lot of subs getting close to their carriers, sure, but a sub is what? one percent of a carrier in terms of manpower and industrial production? We can afford to lose fifty subs for every flat-top we sink and still come out ahead in terms of attrition. And we have a bigger population and industrial base to begin with.
As an aside, if the USN blockades the Atlantic, it might be more prudent to simply write off the Atlantic trade and go through the Med to SE Asia. There we can sail in our territorial waters and/or neutral waters all the way to our destination. It would hurt, sure, but I think it would hurt a lot less than arguing with a power that has 27 thousand megaton and is known to react negatively to people shooting at its soldiers...
- Jake If you only spend 20 minutes of the rest of your life on economics, go spend them here.