I'm not really sure how much of an effect that would be, isn't the Texan secessionist movement is just a joke that no one takes seriously? In my personal understanding, Texas and some other secessionist movements aren't really about seceding, its more about dick measuring nationalist supremacy contest withing America itself, but when it comes to fighting some "other" enemy from the outside, like bombing browns, all Americans will happily unite. You can correct me if I'm wrong, I'd like to learn more.