Spain. "Remember the Maine, Down with Spain!"
In the study of history as an academic discipline, a primary source is an artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was created at the time under study. It serves as an original source of information about the topic
The balance of power, depended on its effectiveness upon clearly defined, centrally controlled, independent entities, whether empires or nation states, which recognize each others sovereignty and territory
The answer is either A or B, but A sound like a better answer to me.
