Which of the following prohibited slavery in some parts of the United States?

The Articles of Confederation served as the first constitution of the United States but did not address the issue of slavery. They focused primarily on the governance and operations of the national government, leaving the status of slavery largely unregulated and allowing states to make their own decisions regarding the institution.

The United States Constitution, ratified in 1788, did not prohibit slavery. In fact, it contained provisions that protected the institution, such as the Three-Fifths Compromise, which counted enslaved individuals as three-fifths of a person for representation purposes. This document allowed slavery to persist and did not impose restrictions on it.

The Bill of Rights, ratified in 1791, consists of the first ten amendments to the Constitution, focusing on individual liberties and limiting government power. It does not address slavery at all and thus does not contain any provisions to prohibit or regulate the institution in any form.