This is a great interactive map:
http://www.nytimes.com/2014/08/16/upshot/mapping-migration-in-the-united-states-since-1900.html?WT.mc_id=2015-Q1-KWP-AUD_DEV-0101-0331&WT.mc_ev=click&bicmp=AD&bicmlukp=WT.mc_id&bicmst=1420088400&bicmet=1451624400&ad-keywords=AUDDEVMAR&kwp_0=10713&kwp_4=78887&kwp_1=125946&_r=0&abt=0002&abg=0
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