According to the 1850 census, in what ratio did people of African descent account for the American population?

One in six.

Explanation:

The census of 1850 was the seventh census of the United States of America. what make apart from the ones was instead oh head of Household, every person's name was to be included. Congress passed a bill in March 1849, through which a census board was set up represented by the secretary of state, the attorney general and the postmaster general.