Houston is pretty much the perfect example of the once-touted multiethnic future of the US. We've got a large number of people, a large diversity of socioecoethnic backgrounds, and we are a much more integrated city due to lack of zoning and only relatively recent gentrification.

Additionally, note that there was an (arguably recent) influx of folks from New Orleans during Hurricane Katrina--that had lasting economic and demographic impacts on large parts of Houston, especially around Reliant.