Answer:
it was a vast, unified empire of many cultures
Explanation:

This sentence gives no reason to add any commas what so ever. This would be a straight forward run-on sentence that would need no clause, pauses or anything that would break this sentence down any more.
Option B would give clear and straight forward information. The first option broke this sentence down as we can see, and as for this, this would not be the proper way of expressing this sentence. Therefore, your
last option would then be your answer.
Answer:
An official banner authorized by the Department of Defense for display by families
Explanation:
Yes, becuase if it was taken during that time of period it is a primary source
In the 1877 presidential election Rutherford H. made a deal with southern democrats so that he could become president.
Rutherford Hayes promised to remove the last troops from the south and put an end to Reconstruction in the states of South Carolina, Florida, and Louisiana.