The Constitution of the United States
Article I, Section 1:
All legislative Powers herein granted shall be vested in a Congress of the United States
Article II, Section 1:
The executive Power shall be vested in a President of the United States of America.
Article III, Section 1:
The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish.
As delegates were leaving the Constitutional Convention on September 17, 1787, a woman asked Benjamin Franklin “What have we got?”
Franklin: “A republic, if you can keep it.”

