If Canada was a state, the Republicans would never win the electoral college again. There would never be another Republican president.
And the House of Representatives would be permanently blue.
And even just 2 more senators would be a massive risk for the Republicans too. If each province was a state, it would be game over in the senate as well.
California, Texas, New York, and Canada would all be blue in 2028. There are only so many Floridas and Texas is not guaranteed.
And if the Canadians in Florida and Arizona and Nevada could vote, they may not be as red anymore either.
Canada will never be a state. But it would certainly kill the US Republican Party if it did.