Donald Trump, the US President-elect, recently suggested an eye-popping idea: Canada should become the 51st state of the United States. This proposal came up during a dinner with Canadian Prime Minister Justin Trudeau at Trump’s Mar-a-Lago estate, according to Fox News.

The dinner took place after Trump had already made some bold threats. He said he would impose a 25% tariff on goods coming from both Canada and Mexico once he takes office. Why? Because he believes illegal immigration, cr...