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Not as big a portion of the country, but yeah coastal areas will often have a large population living in roughly a line.
In North America I believe the line connecting the most people would go from Quebec City through Montreal, Ottawa, Toronto, London, Detroit, Chicago, Milwaukee and Minneapolis (though maybe not within just 5 km of it). This is the most populous part of the Great Lakes Megalopolis and into the St. Lawrence.
I’ve had cats my whole life and have never had one mess with my properly placed toilet paper.