Pigs were brought to southeastern North America

Pigs were brought to southeastern North America from Europe by Hernando de Soto and other early Spanish explorers. Pig snout are particularly valued in China and on certain oceanic islands, where their self-sufficiency allows them to be turned loose, although the practice is not without its drawbacks (see Environmental impact). With managed rotational grazing techniques pigs can be raised in an environmentally sound manner on pasture much like grazing sheep, goats and cows without high grain inputs.

http://en.wikipedia.org/wiki/Pig