The Chinese that migrated were almost entirely of Cantonese origin. Hundreds of thousands of Chinese men in the U.S, mostly of Cantonese origin from Taishan migrated to the United States. Anti-miscegenation laws in many states prohibited Chinese men from marrying white women. After the Emancipation Proclamation, many intermarriages in some states were not recorded and historically, 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. After the Emancipation Proclamation, many Chinese Americans immigrated to the Southern states, particularly Arkansas, to work on plantations. For example, in 1880, the tenth US Census of Louisiana alone counted 57% of interracial marriages between these Chinese to be with black and 43% to be with white women. Between 20 and 30 percent of the Chinese who lived in Mississippi married black women before 1940. In a genetic study of 199 samples from African American males found one belong to haplogroup O2a ( or 0.5% ) In the 1960s census showed 3500 Chinese men married to white women and 2900 Chinese women married to white men. It also showed 300 Chinese men married to Black women and vice versa 100.