In OTL at least, the land unfairly 'stolen' from Canada by the Treaty of 1846 was incorporated into the United States as Washington State, along with Oregon. Probably best known abroad for being the location of Seattle and their late Supersonics (rest their souls), and by extension, Microsoft headquarters.
If you're from here, feel free to add yourself to the list.
Douglas once started a campaign to have Washington returned to its rightful place as a province of Canada.