US/Canada merger

Some people think the U.S. and Canada should merge into one country.  "Such a merger makes perfect sense. No two countries on Earth are as socially and economically integrated as the U.S. and Canada... Truth be told, the merger of the U.S. and Canada is already well under way. As many as one in 10 Canadians (more than 3 million people) live full- or part-time in the U.S., and an estimated 1 million Americans live in Canada."