In a scene from the movie "Lincoln," a Democrat arguing against passage of the 13th Amendment derisively mentions the idea of interracial marriage to ridicule the legislation that would abolish slavery.
A century-and-a-half later, as an African-American president is inaugurated for a second term, interracial unions still are relatively rare.
And faith groups may be part of the reason Americans still find it so difficult to transcend race and ethnicity in matters of the heart, new research indicates.
Believers played a major role in the civil rights movement, but the voluntary segregation still found in houses of worship on Sunday mornings appears to limit the likelihood non-Hispanic white Americans will date, much less marry, a black, Hispanic or Asian partner.
In one national study of dating practices, researchers found those who attended church most often were far less likely to have dated someone from another race.
And in a separate study of more than 12,000 people who were or had been married, only Catholics were significantly more likely than people from other traditions to cross significant racial or ethnic boundaries.
"Segregated churches breed segregated lives," says researcher Samuel Perry of the University of Chicago.
Segregated pews