What did the Gettysburg Address emphasize?

The Gettysburg Address emphasized two interlocking themes: the founding proposition that all people are created equal, and the imperative of preserving the Union dedicated to that proposition. Lincoln's 272 word speech opened by dating the founding to 1776 rather than to the Constitution of 1787, signaling that the Declaration of Independence and its principle of equality formed the moral foundation of the United States. He said the nation was conceived in Liberty and dedicated to the proposition that all men are created equal. By framing the founding around that proposition, Lincoln implicitly committed the country to fulfilling the promise the Declaration had left unfinished.

The Civil War, in Lincoln's framing, was a test of whether such a nation could endure. He immediately defined the conflict not as a regional dispute over tariffs or constitutional structure but as a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. He thereby transformed the war's meaning. The earlier rhetoric of the war had emphasized preserving the Union as a constitutional and political fact. Lincoln raised the stakes by suggesting that what was being preserved was not just a government but the proposition of human equality embodied in self government.

The middle of the speech offered a paradoxical observation: the living could not consecrate the cemetery because the brave men who fought there had already done so by their sacrifice, and the world would little note nor long remember what we say here, but it can never forget what they did here. Lincoln's modesty has often been noted.

The conclusion called on the living to dedicate themselves to the unfinished work of those who fought, to take increased devotion to that cause, and to ensure that government of the people, by the people, for the people shall not perish from the earth. This last phrase is one of the most quoted descriptions of democratic government in any language. It echoed phrases from John Wycliffe's 14th century preface to his English Bible translation and from Daniel Webster's 1830 Senate speech, but Lincoln crystallized the formula.

By emphasizing equality, sacrifice, and the survival of democratic government, the speech transformed the war from a struggle to preserve a political union into a struggle to fulfill the founding promise. After the speech and especially after the war, the Reconstruction Amendments (Thirteenth, Fourteenth, and Fifteenth) wrote that promise into the Constitution explicitly. Modern Americans often invoke the speech's language, particularly in moments of national crisis or commemoration.