What the answer to this question by explain it

First off the railroads allowed people to be transported from one city to another in half the time from them walking. This allowed families to see each other and friends to visit. However one problem was how African Americans were treated they were sat in different train cars because of their skin color making a huge drift between whites and African Americans. Nature was affected because trees had to be removed to build the railroads and many forests suffered because of this. Not to mention the smoke from the trains which would pollute the air. Hope this helps.

Explanation:

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.