‘The only people with any right to be in this country are the Native Americans’

To which Derb responds:

If true, this suggests two possible courses of action:

(1) We non-Native Americans should all leave the U.S.A.

(2) We should learn an obvious lesson from the experience of the Native Americans:

If you let masses of foreigners flood into your country for long enough, it will eventually become their country.

Which of these two courses of action do you recommend?