as "[a] person having origins in any of the black racial groups of Africa" through racial categories used in the UCR Program adopted from the Statistical Policy Handbook (1978) and published by the Office of Federal Statistical Policy and Standards, U.S. Department of Commerce, derived from the 1977 Office of Management and Budget classification. Admixture Historically, "race mixing" between Black and White people was taboo in the United States. So-called anti-miscegenation laws, barring Blacks and Whites from marrying or having sex, were established in colonial America as early as 1691, and endured in many Southern states until the Supreme Court ruled them unconstitutional in Loving v. Virginia (1967). The taboo among American Whites surrounding White-Black relations is a historical consequence of the oppression and racial segregation of African Americans. Historian David Brion Davis notes the racial mixing that occurred during slavery was frequently attributed by the planter class to the "lower-class White males" but Davis concludes that "there is abundant evidence that many slaveowners, sons of slaveowners, and overseers took black mistresses or in effect raped the wives and daughters of slave families." A famous example was Thomas Jefferson's mistress, Sally Hemings. Although publicly opposed to race mixing, Jefferson, in his Notes on the State of Virginia published in 1785, wrote: "The improvement of the blacks in body and mind, in the first instance of their mixture with the whites, has been observed by every one, and proves that their inferiority is not the effect merely of their condition of life". Harvard University historian Henry Louis Gates Jr. wrote in 2009 that "African Americans...are a racially mixed or mulatto people—deeply and overwhelmingly so" (see genetics). After the Emancipation Proclamation, Chinese American men married African American women in high proportions to their total marriage numbers due to few Chinese American women being in the United States. African slaves and their descendants have also had a history of cultural exchange and intermarriage with Native Americans, although they did not necessarily retain social, cultural or linguistic ties to Native peoples. There are also increasing intermarriages and offspring between non-Hispanic Blacks and Hispanics of any race, especially between Puerto Ricans and African Americans (American-born Blacks). According to author M.M. Drymon, many African Americans identify as having Scots-Irish ancestry. Racially mixed marriages have become increasingly accepted in the United States since the civil rights movement and up to the present day. Approval in national opinion