Anti-miscegenation laws or miscegenation laws are laws that enforce racial segregation at the level of marriage and intimate relationships by criminalizing interracial marriage and sometimes also sex between members of different races. Anti-miscegenation laws were first introduced in North America from the late seventeenth century onwards by several of the Thirteen Colonies, and subsequently, by many U.S. states and U.S. territories and remained in force in many US states until 1967.