What is the purpose of drawing a social pyramid?

A social pyramid is aimed to defined a social structure, where powerful people, like presidents, are in the top. And common people is in the bottom.

Also, a social pyramid is used to specify the importance of each social step. For example, in a democratic government we can that the base of the pyramid if the people, they are the most important part of the government, without that base, the pyramid falls.

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.