I'm not trying to be mean here, just take your point to a higher level, one that gets at the heart of the issue. I disagree that the US Empire is being imperialist because of "an imperialist attitude." Imperialism is not merely a whim, it's a material process that evolves from earlier stages of capitalism. As capital consolidates, forming monopoly finance capital, it seeks to endlessly expand beyond its borders. This search for new profits leads to the establishment of military monopoly, IP monopoly, dollar monopoly, and cultural monopoly. This is the origin of institutions like the IMF, NATO, and more, and are how the US actually gains the wealth it has at it's highest levels.

What's important here is it means that an individual president cannot stop it. It also means that the west in general is reliant on these very same institutions, and thus benefits from it. Canada is an interesting point to bring up. Canada, like the US, is both an imperialist state, and a settler-colony. Canada too is reliant on imperialism and the very same institutions the US is. The US, however, is hegemonic, while also rapidly losing its unipolar position thanks to the rise of China and the global south in general. This leads it into conflict with its former allies, secondary imperialist powers, much the same as how Germany began colonizing Europe the same way Europe colonized the rest of the world.

What remains necessary is as I said, ending capitalism to end imperialism, and we can only do so through the establishment of socialism.