Multiracial Americans are surging. But data erases them

America is becoming more multiracial, but its data systems are still thinking in black and white. Why it matters: Outdated measurement systems are shaping how elections are analyzed, health risks are tracked and civil rights laws are enforced.The multiracial ("Two or More Races") population grew from nine million in 2010 to 33.8 million in 2020, per the U.S. Census. The multiracial population is expected to keep growing faster than most groups, and exactly how fast depends as much on how America...