If the Confederacy had won the Battle of Gettysburg, it would have mattered because then the Confederacy would have invaded the North, and the Civil War could have taken place in both the North and the South. Also, this would have been another victory for the Confederacy, so their confidence would have been very high, wherease the Union would still have low confidence. The Confederacy still would not have gained the support of England and France because they would have still been seen as hypocrites for helping the South, which had slavery. Lincoln would have probably made peace because if the war continued, the battles could take place in the North, and eventually cause so much damage that he would have had to make peace anyways.