1. Manifest Destiny Timeline
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2. 1782 Treaty of Paris
 Signed in Paris by representatives of King George III of Great Britain and representatives of the United States of America on 3 September 1783, ended the American Revolutionary War. 
Ceded all lands east of the Mississippi River to the United States.

3. 1803 Louisiana Purchase
The Louisiana Purchase (French: Vente de la Louisiane "Sale of Louisiana") was the acquisition by the United States of America in 1803 of 828,000 square miles (2,144,000 square kilometers or 529,920,000 acres) of France's claim to the territory of Louisiana.

4. 1819: Adams-Onis Treaty (Transcontiental Treaty)
The Adams–Onís Treaty of 1819,[1] also known as the Transcontinental Treaty or the Purchase of Florida,[2] or theFlorida Treaty,[3] was a treaty between the United States and Spain in 1819 that gave Florida to the U.S. and set out a boundary between the U.S. and New Spain (now Mexico).

5. 1820: Henry Clay’s American System
originally called "The American Way", was an economic plan that played a prominent role in American policy during the first half of the 19th century.
the plan "consisted of three parts: a tariff to protect and promote American industry; a national bank to foster commerce; and federal subsidies for roads, canals, and other 'internal improvements'

6. 1823: Monroe Doctrine
as a US foreign policy regarding Latin American countries in It stated that further efforts by European nations to colonizeland or interfere with states in North or South America would be viewed as acts of aggression, requiring U.S. intervention

7. 1829: Andrew Jackson becomes seventh president

8. 1836: Battle of Alamo was a pivotal event in the Texas Revolution

9. 1845: Annexation of Texas
Texas becomes a part of the United States.

10. 1845: James K. Polk becomes 11th President

11. 1846: Britain cedes Oregon to the United States
Oregon's area was inhabited by many indigenous tribes before traders, explorers, and settlers arrived. An autonomous government was formed in Oregon Country in 1843, Oregon Territory was created in 1848, and Oregon became the 33rd state on February 14, 1859.

12. 1847: Treaty of Guadalupe Hidalgo (Mexican cession)
 is the peace treaty signed on February 2, 1848, in theVilla de Guadalupe Hidalgo (now a neighborhood of Mexico City) between the United States (US) and Mexico that ended the Mexican–American War (1846–48).

13. 1848: Discovery of Gold in California
gan on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill inColoma, California.[1] All told, the news of gold brought some 300,000 people to California from the rest of the United States and abroad.[2]Of the 300,000, approximately half arrived by sea, and half came overland from the east, on the California Trail and the Gila River trail.

14. 1853: Gadsden Purchase
is a 29,640-square-mile (76,800 km2) region of present-day southern Arizona and southwestern New Mexico that was purchased by the United States in a treaty signed byJames Gadsden, the American ambassador to Mexico at the time, on December 30, 1853

15. 1869: Transcontinental Railroad
In the United States of America, a series of transcontinental railroads built over the last third of the 19th century created a nation-wide transportation network that united the country by rail.