Answer:
Slavery played the central role during the American Civil War. The primary catalyst for secession was slavery, especially Southern political leaders' resistance to attempts by Northern antislavery political forces to block the expansion of slavery into the western territories
I very important place would be places like the Aztec ruins, or Anasazi ruins because it has a lot of history, and many Native Americans call the Anasazi their decedents.
It is a becuase it only makes the most sense out of all of them
Archaeology is the answer
The defeat caused rulers to lose prestige and led to the fall of the Qing government.