Context: The 1850 census saw a dramatic shift in the way information about residents was collected. For the first time, free persons were listed individually instead of by head of household. There were two questionnaires: one for free inhabitants and one for slaves. The question on the free inhabitants schedule about color was a column that was to be left blank if a person was white, marked "B" if a person was black, and marked "M" if a person was mulatto. Slaves were listed by owner, and classified by gender and age, not individually, and the question about color was a column that was to be marked with a "B" if the slave was black and an "M" if mulatto.

Question: In what year were free persons first listed individually in the US census?
Answer: 1850

Question: How were free persons listed in the US census prior to 1850?
Answer: by head of household

Question: In the 1850 US census, what was put into the color column for black persons?
Answer: B

Question: If M was marked in the color column for a person in the 1850 census, How were they classified?
Answer: mulatto

Question: How were slaves listed in the 1850 US census?
Answer: by owner