By Christopher B. Daly
Pew Research has the answers. And the folks at Pew have converted that data into an interactive world map. Nicely done.
Here’s the map showing where folks came from to the U.S. (the darker the country, the greater the number of emigrants it supplies to us)
Turns out, the No. 1 source of immigrants is Mexico, by a large margin. Then came China, India, Philippines, Puerto Rico, Vietnam, El Salvador, Cuba. You can also use the Pew map to track migration to other countries.
Prof Chris Daly's Blog 
“in the last 25 years” might have been a useful clarification. India, for example had very few immigrants to the US for most of the 20th century as a result of a specific law of exclusion.
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