The world saw a major increase in population, which, along with an increase in living standards, led to the depletion of natural resources. The use of chemicals and fuel in factories resulted in increased air and water pollution and an increased use of fossil fuels.
I think a good answer would be "resources" - in a total war, a nation wants to put all the effort they can into the war, so they will use all their resources for it.
The correct answer is
Washington estimates the number of soldiers on each side.
Answer:
The Canadian divisions were joined by the British 5th Infantry Division, and reinforced by artillery, engineer and labour units. The Canadian Corps was supported to the north by the 24th British Division of I Corps which advanced north of the Souchez river and by the advancing XVII Corps to the south.