Anti-miscegenation laws were passed in most states during the 18th, 19th and early 20th centuries, but this did not prevent white slaveholders, their sons, or other powerful white men from taking slave women as concubines and having multiracial children with them. In California and the western US, there were greater numbers of Latino and Asian residents. These were prohibited from official relationships with whites. White legislators passed laws prohibiting marriage between European and Asian Americans until the 1950s.
Is there an answer to this question (If it cannot be answered, say "unanswerable"): Why did the anti-miscegenation not insure that there was no interracial mixing?
white men from taking slave women as concubines and having multiracial children with them