I think the answer is true because John Brown was against slavery.
The abolitionist movement was very powerful in the North, since the North did not rely heavily on a slave population and because slavery had long-since been depleted in the region.
Political science uses a scientific approach. Political scientists approach their studies in an objective, rational, and systematic manner.
A, "I think, therefore I am".
This is a quote from Descartes' book the Discourse on Method.
India had ceased importing opium
During the age of imperialism, Britain used opium to forcefully open china to trade.