The only time the US participated in overthrowing governments in Latin America is when they thought they might go Communist. Democratic socialists didn't have much to fear, just like French Socialists, British Labor, German SPD, or any of the Scandinavian countries had anything to fear.
When there were coups, it was generally because there were people in the country who desperately wanted to get rid of their own government, but they wanted to make sure the US would not side with the real government. US involvement was generally brought in near the end of the plot and did not instigate the coups (there are exceptions like in Guatemala). This is not to excuse US actions, but to place them in their proper context.
To get Canada into the same place where the US would think vital interests were threatened by the Canadian government would require so many changes as to make the world very strange from OTL.