How is it known what number of people each State contains? A. Certain persons are appointed to count the people and take a written list of them. Such a counting is called a census, and it takes place once in every ten years. [In the year 1790 the United States contained 3,929,326; in 1800, 5,309,758; in 1810, 7,239,903; and in 1820, 9,638,166.]
Census
