I believe the correct answer is Bacon's Rebellion.
It was an event which happened in 1676 when lower classes rebelled against the system in which they were not being treated equally as the upper classes. This was the first rebellion of such nature and it lead to greater democracy in the States.
Answer:
The Battle of Shiloh in April 1862
Explanation:
The battle in Shiloh in April 6-7, 1862, is considered as the biggest hinderance to Union's victory, as the battle was the bloodiest of the Civil War, with a total casualties for both Union and Confederates sides numbered over 20,000. This battle ended without any clear winner.
However, some considered Union to have won by a narrow victory, after the battle of Shiloh, Union troops laid siege to Corinth, forcing Confederate troops to withdraw Memphis Tennessee, which eventually fell to Union forces on June 6 1862.
