Changes in affirmative action policies in some states create possibilities for "natural experiments" to observe the effect of public policy on racial and ethnic inequality in American society. This study measured the impact of Initiative 200, a ballot measure that eliminated affirmative action in Washington State, on the transition from high school to college. As of 1999, the year after I-200 passed, the proportion of minority high school seniors who went to college in Washington State decreased temporarily. The impact of I-200 was registered almost entirely at the University of Washington, the flagship public institution in the state. This decrease, however, stemmed less from changes in minority admission rates than from declines in application rates. Affirmative action programs may provide a signal of an institutional "welcoming environment" that serves as a counterweight to the normal reluctance of prospective students to apply to institutions that may be perceived as intimidating. Although the impact of I-200 was short-lived, significant racial and ethnic differences remain in the transition from high school to college.