SPRINGFIELD — The document in which Abraham Lincoln set the Union’s military response to the launch of the U.S. Civil War in motion is now among Illinois’ prized papers of the 16th president, thanks to a donation by the state’s governor and first lady.The order to prevent the Confederacy from shipping economically vital cotton or importing critical needs was signed April 19, 1861 — one week after secessionist forces fired on Fort Sumter at the entrance to Charleston harbor in South Carolina. An anonymous collector who …