Write a short essay to summarize the cycles through which empires pass. ?

Powers of states the first letter of the answer is r.

Which impact did the civil war have on the spread of disease in texas a. disease decreased bc people left the area to fight in the war b. disease increased bc medicine was in short supply. c. disease increased bc many new diseases were brought to the area d. disease decreased bc confederate doctors distribute new medicines to local communities

How does the balance of trade look different in the us today vs hot it looked in the 70's