Phoenicia was a collection of city-states.
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Answer:
Shipping goods between the east coast and the west coast was made easier by the Transcontinental Railroad.
Explanation:
The building of the transcontinental railroad opened up the American West to more rapid development. The railroad also facilitated westward expansion, escalating conflicts between Native American tribes and settlers who now had easier access to new territories.
Each take on one task for the President so that he does not have to overload himself with work.
Brown v. Board of Education was a landmark case in which it was finally proven that segregation in institutions of education was highly unconstitutional, so you could say that that is the greatest effect since it made other schools become open for everyone as well.