question: What are some historical reasons multiracial Americans have been classified as black ?
answer: slavery , partus sequitur ventrem , one-eighth law , the one-drop rule of 20th-century legislation
turker_answer: Some historical reasons multiracial Americans have been classified as black include slavery , partus sequitur ventrem , one-eighth law , and the one-drop rule of 20th-century legislation .
rule-based: Some historical reasons multiracial Americans have been classified as black are slavery , partus sequitur ventrem , one-eighth law , the one-drop rule of 20th-century legislation .