The Triple Alliance and Triple Entente were formed through the signing of

after defeating german forces in north africa allied leaders turned their attention to "italy," since this was the location that made the most geographic sense before invading northern europe via france. 

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.

traditionally, roman society was rigid. by the first century. however, the need for capable men to run rome's vast empire was slowly eroding the social barriers. the social structure of ancient rome was based on heredity, property,wealth, citizenship and freedom.