[gota]

Regarding:

> (1) Genuine ethnic diversity (simply unmatched in its breadth and scale)

Brazil matches and surpasses, as far as I know

Edit: a quick google search indicates this is a controversial topic, to say the least

Also, kudos for recognizing that this is a valuable characteristic of a place for quality of life. Genuine ethnic food restaurants, a wide variety of interesting events and festivals, diverse influence in music and cultural hightlights... it does make a lot of difference for people attuned to its effects