i believe the answer is the preamble ^^
Timeline of Westward Expansion.
Manifest Destiny. ...
Louisiana Purchase. ...
The Corps of Discovery Expedition (Lewis and Clark Expedition) ...
The War of 1812. ...
Missouri Compromise and the Kansas-Nebraska Act. ...
Monroe Doctrine. ...
Indian Removal Act and the Trail of Tears.
Answer:
conversion to Christianity
Explanation:
I could be wrong but i think its the first one because many slave owners forced their slaves to become Christian. Some slave holders would let their slaves read but only if it was the bible. People of that time where very much drawn to convert others even if they didn't want to be which is one of the reason so many cultures are dying.