get creative. Florida is overrun with gators.
buy several thousand, dig a big ditch, and fill it with em.
if Texas can’t afford that, start an online fundraising drive
“BUY GATORS FOR THE TEXAS BORDER”.
heck, i would start if off with a couple hundred bucks.
Stock the Rio Grande with piranhas.
Mexicans give gators heart burn...
We have plenty of gators in Texas too.