Why are political parties considered an important part of a democratic political system?

What happened to the american economy after world war i?

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste

What do the differing approaches of booker t. washington and w.e.b du bois suggest about their views of american society?