Manifest Destiny was a belief that emerged in the 19th century, shaping American expansion westward. This notion asserted that the United States was destined to spread its democratic ideals and way of life across the continent. It was driven by a sense of mission and a belief in the superiority of American civilization. Manifest Destiny had a profound impact on American history, particularly in terms of westward expansion.

One example of Manifest Destiny in action was the Louisiana Purchase in 1803. The United States, under President Thomas Jefferson, acquired a vast territory from France, doubling the size of the nation. This acquisition provided the foundation for westward expansion, opening up new opportunities for settlement and economic growth.

Another significant event influenced by Manifest Destiny was the Oregon Trail. This overland migration route allowed thousands of settlers and fortune seekers to travel to the western territories. By enduring arduous conditions and overcoming numerous challenges, these pioneers played a crucial role in fulfilling the vision of Manifest Destiny.

The concept of Manifest Destiny had a profound impact on American society and encouraged westward migration, shaping the nation's political, economic, and social landscape.