“Pigs were first introduced in the 1500’s to what is now the southeastern U.S. by Spanish Explorer, Hernando DeSoto. In the centuries following European exploration and colonization of the eastern U.S., free-range livestock management practices and escapes from enclosures resulted in the establishment of wild pig populations and promoted their spread.”
“Many years later, Eurasian wild boar were introduced into parts of the United States for hunting purposes. In areas where domestic pigs and Eurasian wild boar were found together in the wild, interbreeding occurred. Today, many hybrid populations exist throughout the wild pig’s range.”
Source: Mississippi State University