How and why was the Rhesus monkey spread in the United States? What are borders or boundries limiting distribution?

What are past, current, and future policies/actions that the United States has taken involving the Rhesus monkey? If not the United States, what about it's original habitat in Asia?

Thanks!
(for a report.. very hard to find on the internet..)

The feral Rhesus monkeys in Silver River State Park, Florida, were released by a tour boat operator.