Why did Alaska brake away from the northwest territories?

Alaska did not break away from the Northwest Territories; rather, it was purchased from Russia by the United States in 1867 and became a separate territory. The Northwest Territories are part of Canada, and Alaska is a U.S. state. The two regions have distinct historical and political developments, with Alaska being acquired due to its strategic location and Natural Resources. The separation is rooted in colonial expansion by different nations rather than a breakup of a singular entity.