Census undercount of whites?

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No, the lower than estimated share of Non Hispanic whites, 57.8% vs 59.8% was a 3.3% difference, for blacks it was the same, 12.1% vs 12.5% or 3.2% lower, a lot of blacks and whites who only identified as one race in 2010 chose to identify as multiracial in 2020 dropping their shares below what was projected.