At one time, during the late Pleistocene epoch, woolly mammoths roamed North America. They were close cousins of the Asian elephant, and so you could argue tha

At one time, during the late Pleistocene epoch, woolly mammoths roamed North America. They were close cousins of the Asian elephant, and so you could argue that elephants would not be invasive, any more than horses (current North American horses are from Eurasia, original North American horse species is extinct...).