Persian wars.
Hope this helped
Answer:
The answer is option C. The Spanish Flu of 1918
Explanation: There are some deadly pandemic attacks on the human history which have taken thousands of lives. Pandemic is a break out of any virus transmitted from other animal.The Spanish Flu of 1918 was one of the deadliest pandemic attack which have taken many lives.
One reason the league of nations failed was because "<span>A. It did not establish rules or structure to maintain harmony" since it was more of a general idea structure. </span>
