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I think they were brought to the US in ships ballast in the 1930-40's. I can't remember for sure.
This is where their projected to migrate to eventually.
https://www.ars.usda.gov/southeast-area/gainesville-fl/center-for-medical-agricultural-and-veterinary-entomology/imported-fire-ant-and-household-insects-research/docs/potential-united-states-range-expansion-of-the-invasive-fire-ant/
The only known predator I'm aware of are Pseudacteon phorid flies. I've read they only had a success rate of around 3%, so they're not an actual salvation from the dreaded fire ant.
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