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Where does Silicon Valley’s talent come from? This incredibly detailed map tells all.

The visualization, made by Bloomberg Businessweek, shows the top 100 sources of “imported talent,” from both U.S. states and foreign countries.

According to Bloomberg, “Asian Americans became the majority of the tech workforce in the Valley” in 2010; and one third of Valley startups “are founded by Indian Americans.” In addition, Mexico, Texas, and Arizona rank among the top ten sources of Silicon Valley talent, Bloomberg claims.

Most importantly, this graphic makes crystal-clear why countless entrepreneurs and investors consider immigration reform a top priority.

See the graphic in full right here on BusinessWeek’s site.

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