That's an ugly map. Instead, the US should annex everything except for the Lower Mainland and the Quebec City–Windsor Corridor.
Eh, my thoughts as a barging-in Yankee on what we should annex:
-the Prairie provinces are the most amenable to us and easiest to assimilate (so to speak). Manitoba can be left out if need be (see below).
-British Columbia for geographic purposes. Kick the chinks out and there's a small but significant chunk of red-stater equivalents up there in the interior to slightly counterbalance the left-wing loonyism on the coast. BC is already the Canadian version of the American Pacific Northwest, so what's a bit more added onto that region?
-the Maritimes both for geography to place the whole Eastern Seaboard of North America under one nation's control, and historically/ethnoculturally as "New England extended" - the initial "Anglo" settlers were New England Planters (ie colonists) in the 1760s and another wave of Yankees came as Loyalists in the 1780s, BUT kept strong ties to New England itself in ethnocultural terms despite international division, in contrast to Ontario openly disavowing their American roots for British cultural norms.
-Nunavut, the Northwest Territory, and Yukon to control the Arctic Circle and legendary Northwest Passage, of course.
In contrast, cut loose and do NOT annex:
-Quebec being left out is a no-brainer. America isn't just a White people's country but an Anglo and at least Germanic one, we already have Louisiana as our Gallic influence that we also successfully assimilated, and there's too many spics in the southwest that refuse to assimilate and want it as part of Mexico again. We don't need an even more aggravating version of that in a New North.
-Ontario ultimately became the ultimate Loyalist hub, the nucleus of Canada as we know it, and as noted above the ultimate disavowal of America in terms of Anglo-North Americans. Let it be the Jeet AND leftist/liberal containment zone, and if Manitoba's close to it culturally and geographically (I don't think it's really Great Plains/Prairie proper per se in geography and agriculture like the Dakotas/Nebraska/Kansas and Alberta/Saskatchewan are.... more like Canada's version of Minnesota and northern Wisconsin, which do ultimately tilt eastward?) it can join with Ontario as Official Rump Canada.
-Newfoundland actually seems pretty cool and annexing it to cuck Quebec out of independent oceanic access via the Gulf of St. Lawrence would be hilarious. But they were their own colony-then-province-then literal Dominion till 1949, their own little disconnected cultural sphere versus the rest of English-speaking North America since they were first permanently settled in 1610, and we know all that happened because it's a semi-isolated cold island. I'm good with them being independent and an Official Little Buddy to the USA due to that.
