The correct answer is B. They were prevented from voting
Explanation:
The term "disenfranchised citizens" or "disenfranchisement" refers to the act of preventing or depriving an individual or group of people of voting this is achieved through laws and political measures such as unreasonable requirements or caused by social conditions such as discrimination or intimidation. This implies a disenfranchised citizen is a person that is considered as citizens and therefore, and usually protected by law except in terms of voting. Therefore, the sentence " after 1920 African Americans were the largest group of disenfranchised citizens" means that African Americans were prevented from voting.
One of the main accomplishments of the Congress under the Articles of Confederation was passage of the Northwest Ordinance of 1787 organizing the settlement of the Northwest Territories.
