Ant plants don’t eat ants! They create cavities and mazes to provide homes for ants. In return for the free home, the ants bring nutrients to the plant in the form of pooping and having their food decay inside the plant. If the plant is being eaten, the ants come out and attack it. The plants benefit and the ants benefit.
United States’ ants don’t have a special relationship to these plants, like their native Australasia counterparts. But don’t worry, you do not needs ants in order to successfully cultivate them.