A chicken’s dressed-up-in-a-tuxedo name is Gallus gallus domesticus, which is a nod to the fact that it is a subspecies of Gallus gallus, the wild Jungle Fowl. It is estimated that chickens were domesticated by 2,000 B.C., and possibly much earlier. The evidence points to India as its origin. From there, chickens reached Europe through Greece, with the Romans bringing chickens along on their conquest of Europe. During the Age of Exploration, chickens went along for the ride as a source of food, thereby reaching the New World.
Here’s a picture of Indian Red Jungle Fowl, closest relative to the chicken’s original ancestors: