Much has been made of the dramatic influx of immigrants to the United States since the mid-1960s. This “Fourth Wave” of migration is remarkable not just for its sheer numbers, but also for its ethnic diversity, with newcomers disproportionately arriving from Asia and Latin America. Much too has been made of the changes in how the state classifies and counts by race and ethnicity. Most recently, the Office of Management and Budget (OMB) issued Directive No. 15 in 1977, requiring all federal agencies to collect data for at least five groups—American Indians and Alaska Natives, Asians and Pacific Islanders, non-Hispanic blacks, non-Hispanic whites, and Hispanics—then revised this directive in 1997 to include “mark one or more” responses that would allow for self-identification with multiple races/ethnicities. The face of America is changing before us.Taeku Lee is assistant professor of political science at the University of California at Berkeley (taekulee@berkeley.edu).