Final answer:
The excerpt is from the d) Gettysburg Address, a speech given by Abraham Lincoln at the dedication of the military cemetery at Gettysburg on November 19, 1863.
Step-by-step explanation:
The question, asking about the speech that was given at either Antietam, Fort Sumter, Manassas, d) Gettysburg, or Appomattox, refers to the Gettysburg Address, delivered by Abraham Lincoln.
The Gettysburg Address was a speech by Lincoln dedicating the military cemetery at Gettysburg on November 19, 1863, following the battle that was fought there from July 1-3, 1863.
This speech is one of the most famous in American history and was made to commemorate the soldiers who fought and died during the battle, which marked a turning point in the Civil War and significantly influenced the Union's eventual victory.