What conflicts arose from westward expansion?

Westward expansion in the United States led to significant conflicts, primarily between settlers and Indigenous peoples, as the encroachment on native lands resulted in violent confrontations, forced removals, and broken treaties. The expansion also intensified tensions between Northern and Southern states over the extension of slavery into new territories, contributing to sectional divides that eventually sparked the Civil War. Additionally, conflicts arose with foreign powers, particularly Mexico, culminating in the Mexican-American War, which further reshaped the national landscape.