Final answer:
This document is from the Constitution of the United States, specifically Article V, which outlines procedures for amending the Constitution and admitting new states into the Union.
Step-by-step explanation:
This document is from the Constitution of the United States. Specifically, it is from Article V. This article outlines the procedures for amending the Constitution and admitting new states into the Union. It states that when a state has at least sixty thousand free inhabitants, it can be admitted into Congress on equal footing with the original states.