Politics
Any integrated Canada-US nation will be fraught with enormous political issues. No doubt the domestic political landscape in the US would be transformed with a Canadian presence that would have to be considered way before anybody says “I do” at the “marriage ceremony.”
One thing is certain, the issue of congressional representation cannot be taken lightly. The US Congress would need to accommodate Canada's population of 39.9 million (similar to California’s 39.4 million) including the political leanings of 10 provinces and 3 territories. Based on population alone, Canada could add as many as 52 seats to the House of Representatives and, of course, 2 Senators. These potentially “new voices” could not help but alter the political dynamics inside the “Beltway.”
Consider the fact that Canada's often progressive-leaning population might tilt toward a more “Blue” orientation in America, potentially reshaping the balance of power dynamics. And left-leaning provinces like Ontario and Quebec, with the largest populations, would wield substantial influence in Congress.
What's more, given Canada's population of 39.9 million, this would mean about 54 more electoral votes are up for grabs. Presidential campaigns would need to be reconceptualized.
Canadian voters might even hold sway over the outcomes of presidential elections.
Social and Cultural Issues
Canada’s population would bring the combined U.S. population to about 380 million. The integration would produce a new demographic profile in America. Canada’s multicultural population includes the second-largest Sikh population in the world (800,000), an Indian population (1.85 million) or 5.1% of the Canadian population and a Muslim population (1.77 million) or 5.0% of Canada's total populace. This would increase U.S. diversity, especially in French-speaking regions like Quebec where 8.8 million or 22.0% are Francophones.
A prominent distinction between the two countries is their healthcare systems. Canada embraces universal healthcare funded by taxes. The US healthcare is a mixed private-public system. Integrating the two systems would be challenging but possible.
With Canada's emphasis on healthcare access, environmental policies, and social equity, differences could influence U.S. policies. Canadian voters might push for greater social programming, stricter environmental regulations, and equity-based legislation.
Another issue for the US would be Quebec’s historical desire for independence. The latter would need to feel meaningfully represented within a U.S. system which prioritizes individual states' rights over Canada's centralized federal policies.