Yes. My parents flew halfway across the world with nothing in their pocket, and no family / friends, to be poor in this country. This is not an isolated story. Tens of millions did the same, and by and large, it worked out quite well.
I've been to their country of origin, and I would absolutely not want to be poor there, given what I saw of the poor people.
People will point to all kinds of social problems in America. For example, many Americans believe street homelessness is due to poverty. It's obviously not. I've seen street homelessness due to poverty in the country my parents left, and it looks nothing like what's going on in America.