Hispanics, Asians, and Blacks, latest research fastest growing minority group August 2017 report Pew Research population growth Pew Research Hispanics, Asians, and Blacks, demographically stagnant white population demographically stagnant white population one of the fastest-growing demographics population growth Pew Research Center Hispanics, Asians, and Blacks, Hispanics, Asians, and Blacks, Pew Research Center fertility rate among Hispanic women has declined population growth Pew Research growth of the Hispanic population has leveled off Hispanics, Asians, and Blacks, demographically stagnant white population population growth Hispanics, Asians, and Blacks, population growth demographically stagnant white population