Concerning the USA, "One of the most significant demographic trends in the past 20 years is the explosive growth in ethnic diversity."
USA Today, August 2011

More than Strangers Next Door. . . Our NeighborsMore than Strangers Next Door. . . Our Neighbors - Wednesday, April 09, 2014

This article discusses the Initiative to study the people groups living in the United States and Canada.

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2010 US Census Density Map2010 US Census Density Map - Wednesday, April 09, 2014
A density map using 2010 US Census data covering such topic as Race, Age, Housing, etc. down to the census tract level. read more ...
The Unreached People Groups NOW in cities are NOT GEOGRAPHICALLY distant, they are SOCIO-CULTURALLY and often LINGUISTICALLY distant.