Article 4, Section 4
Tench Coxe, An Examination of the Constitution of the United States of AmericaFall 1787Pamphlets 145--46
The United States guarantee to every state in the union a separate republican form of government. From thence it follows, that any man or body of men, however rich or powerful, who shall make an alteration in the form of government of any state, whereby the powers thereof shall be attempted to be taken out of the hands of the people at large, will stand guilty of high treason; or should a foreign power seduce or over-awe the people of any state, so as to cause them to vest in the families of any ambitious citizens or foreigners the powers of hereditary governors, whether as Kings or Nobles, that such investment of powers would be void in itself, and every person attempting to execute them would also be guilty of treason.
The Founders' Constitution
Volume 4, Article 4, Section 4, Document 4
The University of Chicago Press
Ford, Paul Leicester, ed. Pamphlets on the Constitution of the United States, Published during Its Discussion by the People, 1787--1788. Brooklyn, 1888. Reprint. New York: De Capo Press, 1968.