Taking that idea a bit farther, all who came here to North America were invasive if you were an "Indian". Those who came from England,France,Spain,Sweden and other European countries invaded and then stole the living space from the natvies. I say living spaces as the idea of land ownership was not part of the native's culture. Then to add insult to injury ,we, the Europeans tried to eridcate the natives langauge, culture, ways of life,food sources and traditional tribal territories and went on to kill hunderds of them. If that's not an invasion by an alien element then I don't know what is.