A) The Articles of Confederation INCORRECT The Articles of Confederation was the first constitution of the United States, in effect from 1781 to 1789. It established a loose confederation of states with a weak central government, lacking the power to tax or regulate commerce. While it did pass the Northwest Ordinance, the Articles themselves did not protect individual rights, encourage education, or forbid slavery in territories. In fact, the Articles did not address these issues directly, and its weaknesses led to the Constitutional Convention of 1787.
B) The Northwest Ordinance CORRECT The Northwest Ordinance of 1787 was a law passed by the Confederation Congress to govern the Northwest Territory, which included lands north of the Ohio River and east of the Mississippi. It established a three-stage process for admitting new states, guaranteed settlers' rights such as religious freedom and trial by jury, encouraged education by reserving land for schools, and prohibited slavery in the territory. This ordinance was a major achievement of the Articles of Confederation government and set a precedent for future territorial expansion.
C) The Federalist Papers INCORRECT The Federalist Papers were a series of 85 essays written by Alexander Hamilton, James Madison, and John Jay in 1787-1788 to promote the ratification of the U.S. Constitution. They argued for a strong central government and explained the principles of the Constitution, but they did not address territorial governance or slavery in the territories. The Federalist Papers are a primary source for understanding the Constitution's intent, but they are not a legal document that protected rights or encouraged education in the territories.
D) The U.S. Constitution INCORRECT The U.S. Constitution, ratified in 1788, established the framework of the federal government and protected individual rights through the Bill of Rights, but it did not specifically address education or slavery in the territories beyond the Appalachians. The Constitution did include provisions for admitting new states (Article IV, Section 3) and allowed the federal government to make rules for territories, but the specific protections and prohibitions mentioned in the question were first established by the Northwest Ordinance. The Constitution also did not encourage education, as that was left to the states.