Maps of Segregation in the Milwaukee Metro Area

Take a gander of this map of Milwaukee's segregation maps from the 2000 and 2010 U.S. Census Bureau.  

Did you know that the Greater Milwaukee/Waukesha Metro Area is the #1 most segregated place in the United States?  Why do you suppose it's still this way?

Each Blue Dot = 200 African American Residents

Each Orange Dot = 200 White Residents

Source: "Residential Segregation of Blacks or African Americans: 1980-2000." US Census Bureau

http://www.census.gov/hhes/www/housing/housing_patterns/pdf/ch5.pdf

Here's a Segregation map for the 2010 Census, too, 

which brings in more than just black and white residents:

Source: Sharp, Gwen. The Society Pages. "2010 Census Data on Residential Segregation." 

http://thesocietypages.org/socimages/2011/03/30/2010-census-data-on-residential-segregation/