"Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal."
About this source
Lincoln's brief address at Gettysburg, Pennsylvania, deliberately dated the nation's birth to 1776 rather than 1787, arguing that the Civil War was a test of whether a nation dedicated to the Declaration's proposition of equality could long endure.
Why it matters for the project
Lincoln re-founds the nation on the Declaration's promise of equality — and makes it the war's meaning.