I've never heard this claim however I was interested so I took the 2011 data for US cities with a population of 250K or more and it looks like the distribution

I've never heard this claim however I was interested so I took the 2011 data for US cities with a population of 250K or more and it looks like the distribution isn't even close to support that claim although Detroit looks awful https://docs.google.com/a/migrantgeek.com/spreadsheet/oimg?key=0Aow_fWW33jg_dDcyNTRuRUhOYkZrS3NEZFJLcW9Pc2c&oid=2&zx=sdzm9skyw407 https://docs.google.com/a/migrantgeek.com/spreadsheet/oimg?k...