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- The California Gold Rush.
- The Treaty of Paris - signed on September 3, 1783, officially ended the American Revolutionary War.
- The Oregon Treaty - of 1846 resolved the long-standing boundary dispute between the United States and Great Britain.
- The Louisana Purchase
- In 1803, President Thomas Jefferson purchased the territory of Louisiana from the French government for $15 million. The Louisiana Purchase stretched from the Mississippi River to the Rocky Mountains and from Canada to New Orleans, and it doubled the size of the United States.
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