What is the key ingredient in the cocktail named after the state of Texas?

The cocktail named after the state of Texas is typically associated with tequila. This is due to Texas's close historical and cultural ties to Mexico, where tequila originated. As the state has a significant number of tequila distilleries and a vibrant Mexican influence on its culinary and beverage scene, tequila serves as a prominent ingredient in various Texas-themed cocktails. While vodka, rum, and whiskey have their own distinct uses and flavors in cocktails, they do not have the same connection to Texas as tequila does. Tequila embodies the spirit of the region and is celebrated in the local beverage culture.