Why did Jackson's great victory at New Orlenes have no effect on the war of 1812?

The Battle of New Orleans had no effect on the War of 1812 because the War was already over, the Peace Treaty signed two weeks before the Battle was fought. In an age when news from Europe arrived by sailing ship, no one on either side knew that the Battle need not be fought and that the men who died in the Battle were dying pointless deaths for nothing. The Battle did confirm to the world that America could fight the British successfully, and made Jackson a national hero.