Question

according to Lincoln what do the American people have to do to make sure that the u.s. soldiers who were killed at Gettysburg had not died in vain

Answer 1

American people must reunite again to end hardships and the lost of the lives of fellow Americans by becoming one union again for the greater good of America. If they were to continue to fight then more deaths would come and the deaths of the soldiers in Gettysburg will be in vain because they had fought for the end of the war to reunite the union.