The historical taboo among American whites surrounding white-black relationships can be seen as a historical consequence of the oppression and racial segregation of African-Americans.
In many U.S. states interracial marriage was already illegal when the term miscegenation was invented in 1863. The first laws banning interracial marriage were introduced in the late 17th century in the slave-holding colonies of Virginia (1691) and Maryland (1692). Later these laws also spread to colonies and states where slavery did not exist.
The bans in Virginia and Maryland were established at a time when slavery was not yet fully institutionalized. At the time, most forced laborers on the plantations were indentured servants, and they were mostly white. Some historians have suggested that the at-the-time unprecedented laws banning interracial marriage were originally invented by planters as a divide and rule tactic after the uprising of servants in Bacon’s Rebellion. According to this theory, the ban on interracial marriage was issued to split up the increasingly mixed-race labor force into whites, who were given their freedom, and blacks, who were later treated as slaves rather than as indentured servants.
By forbidding interracial marriage, it became possible to keep these two new groups separated and prevent a new rebellion.
Repealing the Anti-miscegenation Laws
Most states in the Northeast, Northern-Midwest, and Western states with these laws repealed them by 1967 with some, including Pennsylvania, New Mexico, Maine, and Ohio, within a generation of the end of the US Civil War.
The final blow to these laws came with Loving v. Virginia, a landmark civil rights decision of the United States Supreme Court, that invalidated laws prohibiting interracial marriage.
The case was brought by Mildred Loving, a black woman, and Richard Loving, a white man, who had been sentenced to a year in prison in Virginia for marrying each other. Their marriage violated the state’s anti-miscegenation statute, the Racial Integrity Act of 1924, which prohibited marriage between people classified as “white” and people classified as “colored”. The Supreme Court’s unanimous decision determined that this prohibition was unconstitutional and ended all race-based legal restrictions on marriage in the United States.In 2013, it was cited as precedent in U.S. federal court decisions holding restrictions on same-sex marriage in the United States unconstitutional, including in the 2015 Supreme Court decision Obergefell v. Hodges.
There are still plenty of non-governmental organizations opposed to interracial relationships.
Bob Jones University banned interracial dating until 2000 and segregationists (yeah, they still exist), including modern Christian Identity groups, have claimed that several passages in the Bible should be understood as referring to miscegenation with certain verses expressly forbidding it. Most theologians interpret these verses and references as forbidding inter-religious marriage, rather than interracial marriage.