How did the road system change in the U. S. between 1915 and 1940? a. 50,000 miles of highways were paved by the federal government. b. 16,000 miles of highways were paved by the federal government. c. 4,000 miles of highways were paved by the federal government. d. Nothing occurred because of the debt incurred by WWI.

Idon't really understand the question. it counts for 20% of my lesson grade and i really need putting the answer into words. anything will . i need asap so im awarding 30 points.a disagreement between states of the united states concerning the rights of states vs. the authority of the national government led to the civil war. state governments were forced by war into a subservient position. what might happen if national governments ceded their authority to a world government by international treaty?

What similarity can be drawn between state and national governments?

Marine exptoration of oil uses seismic waves to locate oil in the seabed. what is a negative impact from seismic waves on the aquatic ecosystem of the ocean? a.seismic waves kill microoganisms b.seismic waves disrupts the sand and causes seafloor erosion c.seismic waves have virtually no adverse affects on marine life d.seismic waves damage the sonar that dolphins and whales use to orient themselves underwater