Posner Center. Abraham Lincoln drew from the U. S. Constitution and Declaration of Independence as he faced three intertwined crises of the Civil War: secession of the southern states, slavery, and wartime civil liberties. As President, did he “preserve, protect, and defend” the Constitution, or did he abuse his power and trample the Constitution? Featuring the Lincoln Collection of Jo Dzombak. HOURS: Monday-Friday, 1-4 pm or by appointment 412-268-7680.