Forget politics. We are a restless species, and our genomes reveal that even the most intimidating geographical barriers or political measures have managed only to somewhat restrict human movements. Today, international migration is increasing at one to two percent per year, with 244 million people in 2015 living in a country other than the one in which they were born. And we are blending. In highly diverse urban centers such as Singapore, inter-ethnic marriages are rising quickly—from just 7.6 percent of all marriages in 1990 to 21.5 percent in 2015. In the U.S., interracial marriages have doubled since 1980.
The future is mixed race because migration is essential to human success
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