The Louisiana Purchase treaty is an important document in the study of Manifest Destiny because it shows the extent to which the United States was claiming land westward. The correct answer is D.
Your answer is D. A slave would count as three-fifths of a person when counting population for representation, because this was important, as this population number would then be used to determine the number of seats that the state would have in the United States House of Representatives for the next ten years.
