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Thomas Jefferson strengthens democracy during his time as president. -
USA declares war on Britain -
President James Monroe announces new policy, opposing European colonialism in the Western Hemisphere -
American settlers start traveling to the Oregon territory, using the route known as The Oregon Trail -
The Battle of Gonzales marks the beginning of The Texas Revolution -
The Treaty of Guadalupe-Hidalgo marks the end of the Mexican American War. -
Discovery of gold in California brings approximately 300,000 people to the area -
The Civil War begins in the United States between the Union and the Confederacy over slavery and states' rights. -
US Congress passes the Thirteenth Amendment, making slavery illegal in all territories of the USA -
While in Havana Harbor, the ship explodes, killing hundreds of American crew members on board