America’s population of white children, a majority now, will be in the minority during this decade, sooner than previously expected, according to a new report. The Census Bureau had originally forecast that 2023 would be the tipping point for the minority population under the age of 18. But rapid growth among Latinos, Asians and people of more than one race has pushed it earlier, to 2019, according to William Frey, the senior demographer at the Brookings Institution who wrote the report about the shift, which has far-reaching political and policy implications. The single largest increase was among Hispanics, whose birthrates...