Why is the US has cores on Alaska? I am playing a Russia game at the moment, and I refuse to sell Alaska. Now the USA wouldn't want to ally with me because I have her cores. It think it is too biased against Russia.
Historical accuracy. The USA wanted Alaska for two major reasons- It was seen as the last shot at annexing British Columbia as a state (which failed), and in either case, was wanted to ensure that the UK's fleets and armies in the Pacific areas of Canada would be surrounded by the USA in case of war. Basically, the USA would rather have these benefits than an alliance with the faroff Russian Empire- and this is made even more so with the discovery of natural resources such as gold and oil in the region.
Besides, the Russian Empire and the USA were sort of close, but a military alliance between them would be a little bit against the United States of Democracy, Isolationism, and Anti-imperialism.