American exploration refers to the period when European explorers traveled to the Americas to discover new lands and resources. Notable figures like Christopher Columbus and Lewis and Clark played significant roles in mapping the continent and establishing routes for trade and settlement. Their journeys helped expand knowledge about the geography, cultures, and natural resources of North America. The exploration era began in the late 15th century and continued into the 19th century. It led to the establishment of colonies and the eventual westward expansion of the United States. This period significantly impacted the indigenous populations and shaped the future of the nation.