If Americans are descendants from Europeans, how come Europeans are still around?
That is not true.
Only European-Americans are descendant from Europeans. Moreover, had you taken the argument that "If Americans Europeans are descendants from Europeans, how come Europeans are still around?", then you would have compared apples with apples. But in your question you are comparing apples with chestnuts. If we humans are descendants from monkeys, as the evolutionists assert, then there should not be monkeys around as monkeys would have evolved into humans.