He wants to bring an end to the war by reminding his audience of the lives lost at Gettysburg.
The Gettysburg Address is a speech that U.S. President Abraham Lincoln delivered during the American Civil War at the dedication of the Soldiers' National Cemetery in Gettysburg, Pennsylvania, on the afternoon of Thursday, November 19, 1863.
Abraham Thomas Lincoln was an American statesman, politician, and lawyer who served as the 16th president of the United States from 1861 until he was assassinated in April 1865.