I'm reading How the States Got Their Shapes by Mark Stein, and it's an interesting read. Mostly, the states got their shapes because of wars and thievery.
The book got me thinking. Again, dammit. Why would anyone fight over the location of a border? If the Mexicans decided to put up a wall ten miles north of the "official" border, would you throw some guns in your pickup and head down there to fight over it? Jesus, I have a hard enough time just putting food on my family, without thinking about fighting a damn war over an arbitrary line.