Antietam was one of the crucial battles of the Civil War because
a. it ended any further possibility of Confederate invasion of the North.
b. it was the last chance for the Confederates to win a major battle.
c. it fundamentally undermined Confederate morale.
d. the death of Lee's greatest general, Stonewall Jackson, crippled his military effectiveness.
e. it prevented British and French recognition of the Confederacy.
Answer: E