(a) is the answer in studying this actually!
I think it's around the 1850s
I would say <span>d.none of the above
All of those were attempts to </span><span>remove imperial control over other nations.</span>
The Missouri Compromise—also referred to as the Compromise of 1820—was an agreement between the pro- and anti-slavery factions regulating slavery in the western territories. It prohibited slavery in new states north of the border of the Arkansas territory, excluding Missouri.