In November, Arizona joined California, Florida, Georgia, Michigan, Nebraska, Texas, and Washington by banning affirmative action in higher education.  Miller-McCune recently reflected on how these bans are failing to “keep pace with the changing demographics” of the United States.

Take the case of California, as reported in Equal Opportunity in Higher Education, a new book on the state’s voter-approved ban on affirmative action known as Proposition 209. In 1994, four years before the measure went into effect, when colleges were giving a boost to applicants based on race, 38 percent of high school graduates and 18 percent of University of California students were African American, Latino or Native American. In 2008, after a decade with the ban, these minorities represented nearly half of high school graduates but only 20 percent of UC students.

“By stepping back from its commitment to affirmative action, we believe California and other states and colleges have contributed to an increase in racial and ethnic stratification,” wrote co-editors Eric Grodsky, a sociologist at the University of Minnesota, and, Michal Kurlaender, a professor of education at the University of California, Davis. Within college types, [underrepresented minority] students tended to shift from higher- to lower-quality colleges and universities. … African American and Latino undergraduates in the state of California may be worse off now than they were 10 years ago.”

Peter Hinrichs, an economist at Georgetown, also weighs in on the effects of these bans.

Taking a broad look at college enrollment and racial composition across the country between 1995 and 2003, economist Peter Hinrichs found that affirmative action bans have no effect on the typical four-year college or the typical student. But at public universities in the top 50 of the U.S. News & World Report rankings, he found, the numbers of blacks and Latinos typically drop 30 percent and 27 percent, respectively, after affirmative action bans are imposed, compared to pre-ban enrollments, while the numbers of whites and Asian Americans increase 5 percent to 6 percent.

Over a broader range — the top 115 public and private colleges in the U.S. News rankings — the numbers of black and Latino students drop 17 percent and 16 percent, respectively, at schools with affirmative action bans, Hinrichs found.

Some supporters of the bans claim that many students who are ethnic and racial minorities attend mediocre high schools and are thus not equipped for the academic rigors of college.  But, social scientists have found otherwise.

A 2010 study co-authored by Marta Tienda, a Princeton University sociologist, showed that black and Latino students who were admitted to the University of Texas at Austin on the basis of their high school rankings consistently got as good or better grades in college than the affluent whites with higher SAT scores whom they replaced. The minority students also were equally or more likely to graduate in four years.

Read more about these  studies and attempts to replace affirmative action laws in the full article.