Not just politics, but culture.
Exhibit A. Mayonnaise and baked beans
Before the first wave of northen locust voters (ca. 1975- 1980), mayonnaise wasn't used in a lot of Texas cuisine. Now it's the default for BBQ potato salads and hamburgers. The handful of indigenous hamburger joints remaining here use mustard instead of mayonnaise. Practically every carpet-bagging BBQ joint that calls itself "Texas BBQ" uses mayonnaise or miracle whip (instead of mustard) in its potato salad. They also use Boston-style sweet baked beans instead of Texas-style pinto beans.
Mayo and baked beans are gross.
Exhibit B: Gun racks
Prior to the the late seventies - the "Urban Cowboy" era, gun racks were ubiquitous in the rear windows of pickup trucks. Every pickup truck had them. Now they're extinct in Texas. They weren't outlawed; it's a cultural shift I blame on thieving illegals and squeamish locust voters.
Exhibit C: Buck knives
When I was in high school, A Buck 110 knife in a leather sheath was a common accessory. If a student showed up with one now, the school would go into lockdown and a SWAT team summoned. Thanks, you GDMFSOB lowdown sleazebag carpetbagging Yankee locusts.
Good research!
Keller’s on NW hwy served the standard cheeseburger with mustard, you had to ask for mayo.