Texas BBQ Sauce is usually tomato based with hot chiles, cumin, and less sweet than usual.

St Louis BBQ Sauce is generally tomato-based, thinned with vinegar, sweet and spicy. It is not as sweet and thick as Kansas City-style barbecue sauce, nor as spicy-hot and thin as Texas-style.

From Wikipedia: South Carolina is the only state to have four types of barbecue sauces: mustard, vinegar, heavy tomato, and light tomato. The meat used in South Carolina is consistent throughout the state, slow-cooked pulled pork. In the Palmetto State, barbecue is a noun, meaning hickory-smoked, pulled pork. You will never hear a South Carolinian […]

Kansas City BBQ Sauce is thick, red-brown, and contains tomato and molasses…

“Traditional” Georgia BBQ Sauce features a ketchup base flavored with garlic, onion, black pepper, brown sugar, and occasionally bourbon…

Arkansas BBQ Sauce has a thin vinegar and tomato base, spiced with pepper and slightly sweetened by molasses…

Alabama BBQ Sauce is a traditionally mustard and vinegar based and seasoned with roasted or smoked chile peppers, although a white, mayonnaise based sauce is equally popular in the Northwest regions of the state…