Fire ants (Solenopsis invicta) would attack and attempt to replace the native ants (maybe use the abandoned anthill as their initial spawn?).
Fire ants would ALWAYS be aggressive to players and any insect that disturbs their nest. Nearly the entirety of the colony swarm out to meet threats due to a threat pheromone released by a single ant if the scent is close enough to the mound.
A fire ant colony consists of 1 or more queens and the workers (no soldiers are present or needed as the entirety of the worker population have evolved as quite vicious fighters possessing both a bite and