Fire Ants:
In Texas, we have both. Not so many Red Ants anymore though ... thanks to the pesky Fire Ants. Hate those critters!
One of my greatest joys in moving back North from Texas, was the ability to lay down on my yard without being attacked by fire ants. A warm day under a shade tree, hearing the birds, laying on a blanket, for a nice nap. Priceless! (Sometimes waking with a cat butt in my face!)