I remember visiting Texas in the 80's when EVERYTHING was closed on Sundays.
Here in Colorado, they just repealed the Blue Law on alcohol. As of July 1, liquor can be sold on Sundays. Ironically, this was done against the wishes of the liquor store owners. They wanted to remain closed, but the big grocery chains were pushing to sell full strength liquor. (In CO only 3.2 beer can be sold in grocery stores). As a compromise to prevent grocery stores from being able to sell liquor, the liquor store owners reluctantly agreed to open on Sundays. I know none of this makes sense, but this is they way it went down. CO is a funny place politically.
But car sales are still prohibited!!!! Even worse. you can't get repairs on Sunday, either. The reason given for why car dealers want to remain closed on Sundays is NFL football. I'm not kidding.