As President Donald Trump looks to expand the world’s real estate that’s under control, my students in a political science class and I wondered about U.S. Presidents and their legacy, in a discussion of hypothesis tests. We look at the presidents who added territory during their tenure, and compared them to a random sample, as well as those presidents who gave some territories their freedom, independence, or a return to another country.

Trump has set his sights on Greenland, and would like to convince Denmark to sell it. He has called for Canada to be made into the 51st state. He’s talked about repossessing the Panama Canal Zone. He wants all maps to rename the Gulf of Mexico as the Gulf of America. And who knows what else he hopes to add to American control.

John A. Tures is a professor of political science at LaGrange College in Georgia. He can be reached at jtures@lagrange.edu. His Twitter account is @JohnTures2.