What do Abraham Lincoln's "Inaugural Address" and "The Gettysburg Address" have in common and how are they different?

Both Addresses tried to find common ground and values for
Americans. Lincoln made his inaugural address (1861) five weeks before the Civil War
broke out. In it he tried to appeal for a reconciliation with the South to avoid the
war, although the address is firm in rejecting challenges to the Union. Lincoln tried to
reassure Southerners that he would not interfere with slavery and famously shifted the
burden of the Civil War to Southern States:

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In your hands, my dissatisfied fellow countrymen,
and not in mine, is the momentous issue of the civil
war.

Of course, in the
Gettysburg Address (1863), all hope of reconciliation had been lost as the Union and the
Confederacy had been fighting the Civil War for two years. At Gettysburg Lincoln linked
the cause of the War to the revolutionary ideals of freedom that had been elaborated by
those who fought for American Independence in 1776. Lincoln argued for a "new birth of
freedom" raising the war to the high moral ground of the American
Revolution.