American expansionism

American expansionism refers to the 19th-century policy where the United States sought to extend its territory across North America and beyond. This involved acquiring lands through purchase, war, and treaties, driven by the desire for economic growth, strategic advantage, and national strength. Key events included the Louisiana Purchase, the annexation of Texas, the Mexican-American War, and the push for overseas territories like the Philippines. Expansionism shaped America's growth from a collection of colonies into a continental and global power, highlighting a belief in Manifest Destiny—the idea that the U.S. was destined to expand across the continent and influence the world.