Just a simple alternate history scenario, where the Russian Empire manages to keep its Alaskan colony up to the Russian Revolution. This "russianized" Alaska declares independence in 1922 and succeeds to keep the communists on the other side of the Bering Sea (don't ask me how, it's just for the sake of the scenario
). I might update this with a backstory later.
EDIT: I'm considering adding Hawaii or Fort Ross
EDIT x2: I've changed my mind due to timeline diverging problems (if Alaska keeps Hawaii, Pearl Harbor would simply not happen)