Answer:
world war one
Explanation: thats when the slave revolution began
They gave the power to the people because they were fearful that if they had 1 leader(king, queen, or president) then the US would become much like Britain in which they had just broken free of. Hope this helps
Expansionist justified the idea of Manifest Destiny because they said they were spreading democracy. They wanted everybody to be live like they do and to be democratic and what better way to do that than by spreading the word to the people living on the land that they already conquered.
The answer is A. Grasslands.