Answer:
I think the Mississippi river system
Explanation:
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Answer (Westward Expansion) → Westward Expansion (1801-1861) Westward expansion began in earnest in 1803. Thomas Jefferson negotiated a treaty with France in which the United States paid France $15 million for the Louisiana Territory – 828,000 square miles of land west of the Mississippi River – effectively doubling the size of the young nation.
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They were<span> designed by Federalists to limit the power of the opposition Republican Party, but enforcement ended after Thomas Jefferson was elected president in </span>1800<span>. The </span>Alien and Sedition Acts<span> were passed by Congress in 1798 in preparation for an anticipated war with France.</span>
Trains, steel, and new inventions sparked the rapid economic industrialization of america
