GETTYSBURG, Pa. (AP) — On the Civil War battlefield where President Abraham Lincoln gave a speech that symbolized his presidency and the sacrifices made by Union and Confederate forces, thousands gathered Tuesday, historians and everyday Americans alike, to ponder what the Gettysburg Address has meant to the nation. Civil War historian James McPherson and U.S. Interior Secretary Sally Jewell were scheduled to speak to mark the 150th anniversary of the speech. Pennsylvania Gov.