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By SHERYL GAY STOLBERG

CENTRAL POINT, Va. – The house Richard Loving built for his wife, Mildred, is empty now, its front yard overgrown, a giant maple tree shading a birdbath that is slightly askew. It sits down the road from the church graveyard where the couple is buried — a quiet reminder, their granddaughter Eugenia Cosby says, of the lesson they taught the world: “If it’s genuine love, color doesn’t matter.”

Monday will be 50 years since the Supreme Court’s unanimous ruling in Loving vs. Virginia, the landmark case that wiped laws banning interracial marriage off the books in Virginia and 15 other states. Thus did Mildred Loving, both black and Native American, and her husband, Richard, who was white, make civil rights history.

Theirs is a powerful legacy. Today, one in six newlyweds in the United States has a spouse of a different race or ethnicity, according to a recent analysis of 2015 census data by the Pew Research Center. That is a fivefold increase from 1967, when just 3 percent of marriages crossed ethnic and racial lines.