The Louisiana Purchase was one of the greatest milestones in Westward Expansion. It Doubled the size of the United States, added 14 states to the Union, and greatly expanded the United States boundaries. Before the Louisiana Purchase the Boundaries fro the United States were not past the Appalachian Mountains.
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One was the growing superiority of the British Royal Navy, which slowly but relentlessly swept French merchantmen, warships, and troop transports from the seas, thus shutting off the means of taking reinforcements of troops and munitions from France to Canada. hope this helps you :)
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B. <em>Maintaining National Security</em>
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Britain had the first train system, which gave them the best advantage in transporting coal
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