The manifesto given by the Pan-African congress included the political and economic demands of the congress for a new world context of international cooperation.
One way in which World War 1 changed warfare was "<span>C. By using tanks, airplanes, and machine guns," since these changes were part of what made World War I the first real "total war". </span>
Your question does not make any grammatical sense.
Is it who, what, when, where, why?
