Probably because he thinks people could figure that out on their own. He needs to realize that the majority of Ameicans don’t have a clue as to where the BORDER really is.
Do they still have geography as a requirement in Schools? Probably not. AND TEXAS has 1500 miles of border with MX.
Bring the troops home from the third world H holes and put them on the border to stop the hostilities. That is the ONLY way in Texas.
With the drought going on in Texas, it would be such an easy comeback for Perry to just look at the commentator, the audience and then the other candidate and ask if they want to cut Texas off from water all together.