Things fall apart; the centre cannot hold.

Yeats, William Butler. "The Second Coming." W. B. Yeats: The Major Works, edited by Edward Larrissy. Oxford University Press, 2008.

Madison, James. "No. 51: How to maintain: make the parts check each other. Also, a federal system divides power further.--Madison (or Hamilton)." The Federalist: A Commentary on the Constitution of the United States, edited by Robert Scigliano. The Modern Library, 2001.

"The Constitution of the United States." The Constitution of the United States and The Declaration of Independence. Racehorse, 2016, amend. 19, sec. 1.