WASHINGTON — White people will no longer make up a majority of Americans by 2042, according to new government projections. That's eight years sooner than previous estimates, made in 2004. The nation has been growing more diverse for decades, but the process has sped up through immigration and higher birth rates among minority residents, especially Hispanics. It is also growing older. "The white population is older and very much centered around the aging baby boomers who are well past their high fertility years," said William Frey, a demographer at the Brookings Institution, a Washington think tank. "The future of America...