Sports Illustrated wrote about and mapped out where there are the most fans of baseball teams and common fan borderlines,for example the Red Sox and Yankees.

Here’s the link:http://www.nytimes.com/interactive/2014/04/23/upshot/24-upshot-baseball.html?smid=fb-nytimes&WT.z_sma=UP_UCO_20140424&bicmp=AD&bicmlukp=WT.mc_id&bicmst=1388552400000&bicmet=1420088400000&_r=2

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