John Locke's Second Treatise of Government (1690) is available online here.

Editor Samuel Eliot Morison has compiled an excellent collection of founding documents, state constitutions, and pamphlets.

Peter Oliver's Origin and Progress of the American Rebellion (1781) is a Loyalist account of the Revolution, before the Treaty of Paris had formally concluded it.

Adam Smith's An Inquiry into the Nature and Causes of the Wealth of Nations (1776) represents the founding tract of modern economics.

We've got an entire learning guide devoted to the much-hated Stamp Act of 1765 that helped spark the American Revolution.

We have a learning guide on the treaty that ended the war, too.