Answer: continue to fight for the preservation of the Union.
The Gettysburg Address is a speech by Abraham Lincoln delivered during the American Civil War in Gettysburg, Pennsylvania. It is one of the best known speeches in American history.
In this excerpt, Lincoln is honouring those who died at Gettysburg. He exhorts people to continue to commemorate these men's devotion by fighting for the preservation of the Union: "the great task remaining before us."