Final boss idea for the Union of America

Just wanted to suggest a final boss esque thing for the Union of America, after winning in the civil war and getting some progress in reconstruction they should be able to rejoin NATO and join the European War and even the Great Asian War. I am not sure how it would work but it could be a cool feature, that the USA has to fight both China and Russia, there could even be a super event "The Inferno Erupts".

It is just an idea I thought about, I think it could make sense as well as the Union would want revenge against Russia and China for helping their enemies in the civil war.

I don't know how it could be implemented but I thought it could be cool.