
A fundamental aspect of Politics is you cannot choose your neighbors. We actually can though.
If we sell this island to the Japanese, we can go from having a backwater island with under 10,000 people on it, to an island of close to 2 million Japanese, who export Japanese products to the US and Canada, or import products from Canada and the US to their shores.
Japan is also wise to China's tricks, and could act as a bulwark to continued Chinese land holdings and political influence over Canada. Japan makes anime. China loads religous minorities handcuffed and blinfolded into trains so they can be sent to forced labour camps. I'd rather be friends with the Japanese.
What I mean by affirmative politics, is one that's not based on victimhood. One's that isn't based on aggrievement, like so much of politics can be. The entire point of this deal is to make both sides better off through trade, and utilizing the strengths of both countries to cover each others weaknesses.

It's about half the size of Shikoku, which has a population of 3.8 million, meaning if the population density carries over, it would be 1.9 million residents.