A Harvard political scientist finds that racial and ethnic diversity hurts civic life

Michael Jonas:

IT HAS BECOME increasingly popular to speak of racial and ethnic diversity as a civic strength. From multicultural festivals to pronouncements from political leaders, the message is the same: our differences make us stronger.

But a massive new study, based on detailed interviews of nearly 30,000 people across America, has concluded just the opposite. Harvard political scientist Robert Putnam -- famous for "Bowling Alone," his 2000 book on declining civic engagement -- has found that the greater the diversity in a community, the fewer people vote and the less they volunteer, the less they give to charity and work on community projects. In the most diverse communities, neighbors trust one another about half as much as they do in the most homogenous settings. The study, the largest ever on civic engagement in America, found that virtually all measures of civic health are lower in more diverse settings.

"The extent of the effect is shocking," says Scott Page, a University of Michigan political scientist.

The study comes at a time when the future of the American melting pot is the focus of intense political debate, from immigration to race-based admissions to schools, and it poses challenges to advocates on all sides of the issues. The study is already being cited by some conservatives as proof of the harm large-scale immigration causes to the nation's social fabric. But with demographic trends already pushing the nation inexorably toward greater diversity, the real question may yet lie ahead: how to handle the unsettling social changes that Putnam's research predicts.

"We can't ignore the findings," says Ali Noorani, executive director of the Massachusetts Immigrant and Refugee Advocacy Coalition. "The big question we have to ask ourselves is, what do we do about it; what are the next steps?"

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Putnam is the nation's premier guru of civic engagement. After studying civic life in Italy in the 1970s and 1980s, Putnam turned his attention to the US, publishing an influential journal article on civic engagement in 1995 that he expanded five years later into the best-selling "Bowling Alone." The book sounded a national wake-up call on what Putnam called a sharp drop in civic connections among Americans. It won him audiences with presidents Bill Clinton and George W. Bush, and made him one of the country's best known social scientists.

Putnam claims the US has experienced a pronounced decline in "social capital," a term he helped popularize. Social capital refers to the social networks -- whether friendships or religious congregations or neighborhood associations -- that he says are key indicators of civic well-being. When social capital is high, says Putnam, communities are better places to live. Neighborhoods are safer; people are healthier; and more citizens vote.

The results of his new study come from a survey Putnam directed among residents in 41 US communities, including Boston. Residents were sorted into the four principal categories used by the US Census: black, white, Hispanic, and Asian. They were asked how much they trusted their neighbors and those of each racial category, and questioned about a long list of civic attitudes and practices, including their views on local government, their involvement in community projects, and their friendships. What emerged in more diverse communities was a bleak picture of civic desolation, affecting everything from political engagement to the state of social ties.

Putnam knew he had provocative findings on his hands. He worried about coming under some of the same liberal attacks that greeted Daniel Patrick Moynihan's landmark 1965 report on the social costs associated with the breakdown of the black family. There is always the risk of being pilloried as the bearer of "an inconvenient truth," says Putnam.

After releasing the initial results in 2001, Putnam says he spent time "kicking the tires really hard" to be sure the study had it right. Putnam realized, for instance, that more diverse communities tended to be larger, have greater income ranges, higher crime rates, and more mobility among their residents -- all factors that could depress social capital independent of any impact ethnic diversity might have.

"People would say, 'I bet you forgot about X,'" Putnam says of the string of suggestions from colleagues. "There were 20 or 30 X's."

But even after statistically taking them all into account, the connection remained strong: Higher diversity meant lower social capital. In his findings, Putnam writes that those in more diverse communities tend to "distrust their neighbors, regardless of the color of their skin, to withdraw even from close friends, to expect the worst from their community and its leaders, to volunteer less, give less to charity and work on community projects less often, to register to vote less, to agitate for social reform more but have less faith that they can actually make a difference, and to huddle unhappily in front of the television."

"People living in ethnically diverse settings appear to 'hunker down' -- that is, to pull in like a turtle," Putnam writes.

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"Diversity, at least in the short run," he writes, "seems to bring out the turtle in all of us."

The overall findings may be jarring during a time when it's become commonplace to sing the praises of diverse communities, but researchers in the field say they shouldn't be.

"It's an important addition to a growing body of evidence on the challenges created by diversity," says Harvard economist Edward Glaeser.

In a recent study, Glaeser and colleague Alberto Alesina demonstrated that roughly half the difference in social welfare spending between the US and Europe -- Europe spends far more -- can be attributed to the greater ethnic diversity of the US population. Glaeser says lower national social welfare spending in the US is a "macro" version of the decreased civic engagement Putnam found in more diverse communities within the country.

Economists Matthew Kahn of UCLA and Dora Costa of MIT reviewed 15 recent studies in a 2003 paper, all of which linked diversity with lower levels of social capital. Greater ethnic diversity was linked, for example, to lower school funding, census response rates, and trust in others. Kahn and Costa's own research documented higher desertion rates in the Civil War among Union Army soldiers serving in companies whose soldiers varied more by age, occupation, and birthplace.

Birds of different feathers may sometimes flock together, but they are also less likely to look out for one another. "Everyone is a little self-conscious that this is not politically correct stuff," says Kahn.

Boston Globe and Steven Durlauf on Putnam's diversity research