It banned what is usually called affirmative action, which means favoring groups that have suffered discrimination.
White Californians, who tend to oppose affirmative action, made up more than half of the population in 1996 but are now down to 37 percent.
Polling of Hispanics, now 39 percent of the population, as well as Asians at 15 percent and Blacks at 6 percent, indicated support for affirmative action.
ADADVincent Pan, co-chair of the Yes on 16 campaign, is the co-executive director of the San Francisco-based organization Chinese for Affirmative Action.
Some Prop 16 opponents have suggested it would produce racial quotas.