n.b. "sense" is a weasel word, but unfortunately I can't think of a more stringent formulation at this point.
The first is doylist (i.e. from the perspective of the game itself - the question is: Do the rules allow for an invasion?). The USA serve as a bonus boss for the eurasian majors. Therefore, they need to be difficult, but defeatable. Thats simply a need of the game. Most games which have undefeatable enemies are geared from the start to that point (e.g. FTL). The only question here how to balance it, making it a numbers game (and another optimisation problem).
The second is watsonian (i.e. from the perspective of the narrative - the question is: Would an invasion make sense?).
The answer here is, that contrary to what several people espouse, the USA wouldn't be able to out-produce, out-innovate and out-gun the rest of the world together. Especially if the rest of the world has already been in "war mode" for the last two years and the USA hasn't been. The reason for this is in part the severe case of victory disease the USA currently have (no major defeat since inception) - the General Staff of WW2 thought that the USSR would roll over, same mistake, other direction. Short scenario; the USN is sunk (or confined to port) by long-range bombers carrying Fritz-XIII (this implies the Axis sunk or own the Royal Navy) operating out of Greenland or the Carribean. Then the Axis has total rule of the sea and is able to use any old scow to ferry troops.
I don't understand why everybody seems confined to thinking that the only weapon against a navy is a bigger navy, when the US proved something else.
Edit: Since this is a computer game, doylist beats watsonian. So the answer is still yes.
In short: Yes, it should be possible to defeat the USN and invade the states. There are two angles to consider:If one looks at the geographic position of the United States, the nation spans an entire continent, its only land borders leading to hostile desert or tundra unable to support troops prepping for invasion as well as two oceans thousands of km across that separate it from the old world, to large to send a naval invasion across. In order to pull an invasion off you'd need resources of another entire-continent world power (which AFAIK no nation fits baring a united Europe before WW1 when the US military was tiny) as well as a, IMHO, logistics nightmare bigger than what is possible in real life in Hoi4's time frame.
The first is doylist (i.e. from the perspective of the game itself - the question is: Do the rules allow for an invasion?). The USA serve as a bonus boss for the eurasian majors. Therefore, they need to be difficult, but defeatable. Thats simply a need of the game. Most games which have undefeatable enemies are geared from the start to that point (e.g. FTL). The only question here how to balance it, making it a numbers game (and another optimisation problem).
The second is watsonian (i.e. from the perspective of the narrative - the question is: Would an invasion make sense?).
The answer here is, that contrary to what several people espouse, the USA wouldn't be able to out-produce, out-innovate and out-gun the rest of the world together. Especially if the rest of the world has already been in "war mode" for the last two years and the USA hasn't been. The reason for this is in part the severe case of victory disease the USA currently have (no major defeat since inception) - the General Staff of WW2 thought that the USSR would roll over, same mistake, other direction. Short scenario; the USN is sunk (or confined to port) by long-range bombers carrying Fritz-XIII (this implies the Axis sunk or own the Royal Navy) operating out of Greenland or the Carribean. Then the Axis has total rule of the sea and is able to use any old scow to ferry troops.
I don't understand why everybody seems confined to thinking that the only weapon against a navy is a bigger navy, when the US proved something else.
Edit: Since this is a computer game, doylist beats watsonian. So the answer is still yes.