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Explanation:
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D would be correct, yep.
City-states would be independent, but their power would extend very little outside of the city-states borders.
Union Pacific was responsible for the building of the rail lines from Kansas westward.
The Central pacific hired mostly Chinese immigrants to lay its lines. They also used their valuable knowledge of dynamite to help blast through the Rockies.
The railroad lines met at promontory point, Utah. Most of the line had been laid by the Union Pacific, but the Central Pacific had a much harder time getting through the mountains.
