The census calculates that by 2042, Americans who identify themselves as Hispanic, black, Asian, American Indian, Native Hawaiian and Pacific Islander will together outnumber non-Hispanic whites. Four years ago, officials had projected the shift would come in 2050.

The main reason for the accelerating change is significantly higher birthrates among immigrants. Another factor is the influx of foreigners, rising from about 1.3 million annually today to more than 2 million a year by midcentury, according to projections based on current immigration policies. MORE