Canada was still Loyalist British territory. Canada would have been on the opposite side of US and France.

Canada was also not a sovereign nation at that point, It was still multiple colonial territories. What became of Canada was essentially the territory that remained loyalist during the revolution, or territory the rebels americans failed to take.

so in other words, Canada didnt exist back then, it was just Loyalist Colonials and the British vs Rebel Colonials and the French. amongst other minor participants german mercenaries, dutch, natives etc