The historical event that led to the establishment of Native American treaties with the U.S. government was the Westward Expansion, notably during the 19th century. As settlers moved westward, the U.S. government sought to manage conflicts and land claims through various treaties. Such treaties often aimed to relocate Native American tribes to designated reservations and were largely driven by the desire for land acquisition and resources. However, many of these agreements were unjustly negotiated or violated, leading to significant loss of life, culture, and land for Native peoples. These treaties profoundly shaped U.S.-Native American relations and set precedents for future interactions.