Answer: Passing laws that limited the movement and freedom of blacks
Explanation:
Even though the whites in the Northern territories viewed slavery as a moral wrong and a stain on the moral fibre of the United States, they did not believe that Black people should be entitled to the same rights as them.
To keep blacks at a certain social level and to limit the amount of blacks in their territories, some states passed laws that restricted the movements of blacks.
States like California and Kansas did it subtly while states like Iowa, Illinois and Indiana banned blacks entirely from their states.
The answer is Franz Joseph Haydn. :) good luck
Would say the answer would most likely be A as the European powers fought during the opium wars to plunder china's ports of everything since the Chinese government was unable to control their entire expanse of land.