Anti miscegenation
The reason why "Anti miscegenation" would be the correct answer is because this is what it's called when interracial marriage was prohibited.
During the 1950s, The state of Alabama did not allow interracial marriage, due to the fact that they thought it was "not pure" and wanted to keep the white culture pure.
Interracial marriage in Alabama would be considered as a crime during the 1950s, that's why interracial couples who wanted to get married would have to move to a different state if they wanted to be married. In other words, interracial marraige was illegal in Alabama. This meant that white people would have to marry white people and black people would have to marry black people, that was the concept that Alabama had when it was under anti miscegenation.
Alabama was one of the states that were very strict about the prohibition of interracial marriage, especially when it's one of the states that is in the "deep south."
