Respuesta :
The answer is:
The task of preserving the Union has not yet been accomplished.
After the bloody Battle of Gettysburg in 1863, U. S. president Abraham Lincoln delivered a speech to honor the soldiers who gave their lives for the country, and stimulate people to continue to make a better nation. In that respect, the American Civil War would not finish until 1865, so he still wished to encourage Americans to unify the north and south.
The unfinished work is what the soldiers who died at the Battle of Gettysburg were fighting for. He goes on to explain what that was..."the task of preserving the Union". In the speech, he says that the country was founded on the ideal that all men are equal. With the Civil War and the nation split, the country was still an unfinished work striving to be together and with all of its citizens equal.