What sort of laws prohibited the mixing of racial groups through marriage, cohabitation, or sexual contact?

Anti-miscegenation is the sorts of law that prohibited the mixing of racial groups through marriage, cohabitation, or sexual contact,

The purpose of anti-miscegenation is to maintain the condition of 'pure race' within a certain population. It's most famous to be implemented by Hitler During the Nazi era, and united states during colonialism era in 1600s