It occurs to me that if one believes the Biblical account of Creation, then technically, all of us here are descended from immigrants -- even the so-called "native" Americans. As much as I like my country, I don't think Eden was ever located here (North Carolina township notwithstanding).
On a later note, Ken Ham asks his audiences whether kangaroos ever lived in the Middle East, then points to the account of Noah gathering the animals. Good point. In fact, depending on where Noah's antediluvian home was located, and what happened to different land masses after the Flood (some have been submerged ever since), it could be that <i>everyone</i> lives on land that wasn't originally in the family … so to speak.