When did activities occur that demonstrate Americans belief in manifest destiny?

Activities demonstrating Americans' belief in Manifest Destiny primarily occurred throughout the 19th century, particularly from the 1840s to the 1850s. Key events include the annexation of Texas in 1845, the Oregon Trail migration, and the Mexican-American War (1846-1848), which resulted in significant territorial gains for the United States. These actions reflected the widespread belief that it was America's divine right and duty to expand its territory across the continent.