Learn about Manifest Destiny, the 19th-century belief that the United States was meant to expand across North America. This video covers the history behind the idea, key events like the Louisiana Purchase, the Oregon Trail, and the Mexican-American War, and how Manifest Destiny impacted Native American lands and people. Discover how expansion shaped U.S. history, influenced westward migration, and fueled debates over slavery. Whether you're studying American history or just curious about the growth of the United States, this video offers a clear and simple explanation of Manifest Destiny and its lasting effects on the nation.