United States Constitution

The United States Constitution has an Equal Protection Clause (or so I've heard).

Preamble
Here's the preamble : We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

There is some debate about whether there should have been five or six commas in this.

Bill of Rights
It would seem that the dudes who drafted the United States Constitution left a few things out. You know, like what sort of rights that the citizens of the new country should have in exchange for respecting the authority of the federal government. This became the first ten (or so) amendments to the freshly inked replacement for a different document with a few articles in it. Some people call a "document with a few articles in it" a newsletter or a magazine, but it wasn't exactly either of those.

Equal Protection Clause

 * See also: Equal Protection Clause