The nation's racial heterogeneity also partly explains its conservatism. U.S. heterogeneity sharply contrasts with the much greater homogeneity in Canada, Britain and continental Europe. People are much less likely to support income redistribution to people who are members of different racial or ethnic groups. Ethnic divisions make it easier for the enemies of welfare to vilify the poor, by making them seem like parasites who could be rich but prefer to live on the public dollar. The pro-redistribution populists were defeated in the South in the 1890s by politicians who stressed that populism would help blacks (which was true) and that blacks were dangerous criminals (which was not.) The enemies of Lyndon B. Johnson's Great Society also employed racial messages that conveyed the idea that welfare recipients were dangerous outsiders who should not be helped. The sharp racial division that runs through American society makes it possible to castigate poor people in a way that would be impossible in a homogeneous nation like Sweden, where the poor look the same as everyone else.
Across countries, ethnic heterogeneity strongly predicts a smaller welfare state. The U.S. states with larger populations of blacks have historically been less generous to the poor (even controlling for state per capita income). Work by Erzo Luttmer, professor at Harvard's Kennedy School of Government, shows that people who live around poor people of their own races say they want the government to spend more on welfare. But people who live around poor people of another race say they want the government to spend less on welfare. Sympathy for the poor appears to be muted when the poor are seen as outsiders.
Increased immigration to Europe is making those societies more heterogeneous, and we have already seen opponents of social welfare, such as Jean-Marie Le Pen in France, Joerg Haider in Austria and Pim Fortuyn in the Netherlands, use inflammatory anti-immigrant rhetoric to discredit generous welfare payments. We may like to believe that human beings are colorblind, but the reality is that American diversity has always made redistribution less popular here than in more ethnically and racially homogeneous places.