Loving v. Virginia
In 1958, Mildred Jeter, an African American woman, and Richard Loving, a white man, got married in Washington, D.C. They were both residents of Virginia, but had gone to the District of Columbia to get married in order to avoid their state's ban on interracial marriages. After the wedding, they returned to Virginia. They were later arrested in their home and charged with breaking the law. They pled guilty and were sentenced to one year in jail. The American Civil Liberties Union picked up their case and brought it as far as the Supreme Court.
The Supreme Court, in an unusual 9-0 decision, overturned the law banning interracial marriages in Virginia, finding it unconstitutional based on the 14th Amendment.