When writing a "alternate future", or a future that deviates from the current future, because of specific changed variables that deviated in world war II, would the culture of the Northern States remain about the same?

I'm sort of shuffling between cyberpunk and bio-punk, and the only remaining constant is that the Japanese partially won World War II and control a large part of our government.

I asked here, cause I did not watch to hijack the writing about a city you never been thread.