When United States President Donald Trump first floated the idea of annexing Canada, many observers rolled their eyes. The common assumption was that this proposal, like much of Trump's bombast, amounted to little more than a fleeting soundbite.

Yet, amid continuing public remarks about Canada becoming the 51st state and suggestions of genuine intent, the idea has become part of a broader conversation about North America's future.

The idea of the U.S. merging with Canada outright has not been received well in Canada, especially because Trump's threats have been accompanied by economic warfare aimed at forcing Canada into submission. After all, the U.S. already has 50 states. Canada, with its population of about 40 million and its immense geographic size, would be an outsized "51st" by any comparison.

But any serious analysis of this proposition quickly reveals that annexation would be far more complicated and far less one-sided than the label "51st state."

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