I have actually been through The Bronx and never saw any misbehaviour. As I said I know, or rather have heard, that there areas in America that leave something to be desired but that's to be expected in such a large country. I am talking of my own experiences travelling in the U.S.A. and from staying with my brother and sister in law who live in Pennsylvania. I can't think of anywhere else where the immigration officer would give you a smile and say "Welcome to the United States of America"