The nation is undergoing one of the most important demographic transitions in its history. For the first time, minority babies outnumbered white newborns last year, and Census estimates predict that by 2042 non-Hispanic whites will no longer be in the majority. Already, more than a third of Americans are minorities, and non-whites accounted for 92 percent of population growth between 2000 and 2010, a trend driven by rising Hispanic immigration. Meanwhile, as millions of baby boomers retire, the nation is growing older. More than a fifth of Americans will be 65 or older by 2030, compared with one in eight today. Seismic changes also are occurring on the religious front: Protestants are no longer in the majority, and millions have abandoned religion altogether. And, in a striking trend of reverse migration, millions of blacks are moving back to the South.