There is a vindictive part of me that wishes we, the USA, would let them secede. Let them go broke. Imagine the pressure at the Texas and Arizona borders without CBP and no trained Military.

Then, when and if they come to their senses, combine the states like the Dakotas and Carolinas into one each. Saves 4 Senators. Maybe hook Idaho, Montana, and Wyoming into one. Could probably even add Eastern Oregon and NE California. Might even be bigger than Texas and save even more Senators.

Stupid has to hurt.