Canada has almost always been a virtual non-entity due to things like their incredible population sparsity and longitudinal cultural/economic integration with regions of the US. They are a counterexample, but the pattern very much points in my direction IMO.

On top of that, we're talking about _becoming_ a superpower, not being one. Once you're already a superpower, your neighbors often become varying degrees of vassal, which is why Mexico and Canada are among our closest allies. You're hardly a superpower if you haven't neutralized your neighbors (diplomatically or otherwise). Look at the blood feuds over tiny bits of land in the rest of the world, and consider how cool Mexico seemingly is with their land's massive, unprovoked conquest. They accepted it (and their good relationship with us) because they didn't have a better choice.

How many superpowers can you think of that didn't antagonize their neighbors, especially on their way to becoming one? Rome? Persia? Britain? Russia?

Then again, the US has antagonized many countries simply by electing Donald Trump.

[1] In the inter-war period, the US military used a series of color classification schemes to sketch out what the US response to wars with various countries would look like. Red was Britain. And in event of war with the UK, the US plan was to invade Canada, irrespective of Canada declaring neutrality (which was Canada's plan in such a scenario).