Assuming this post is legit, I am sick to think that there are teenagers, our future leaders, who buy into this crap. OP, diversity is necessary to humanity. Literally, at the most basic level of procreation, it’s why inbreeding doesn’t work. It’s why Darwin was able to prove his theory of survival of the fittest. So your friend is poorly informed at best, and at worst, is being manipulated by the current nationalistic fervor espoused by the president.