What is important about the Transcontinental Railroad? How does it help the United States economically?

The transcontinential railroad allowed for more westward expansion.

Explanation:

With westward expansion on the boom the railroad allowed for more supply, people, and the the economy west. In addition to transporting western food crops and raw materials to East Coast markets and manufactured goods from East Coast cities to the West Coast, the railroad also facilitated international trade

answer; ///i do believe that the correct answer is (d); ///athens had a small population;

the answers is b.   environments.