What best describes how the process of westward expansion affected American political liberty?

Westward expansion significantly influenced American political liberty by fostering a spirit of individualism and opportunity, as settlers sought new land and resources. However, it also led to the displacement of Native American populations and the intensification of slavery debates, particularly as new states entered the Union. This expansion highlighted contradictions in American ideals of liberty and equality, ultimately contributing to sectional tensions that would culminate in the Civil War. As a result, while it promoted some aspects of political freedom, it also raised profound ethical and political dilemmas about the rights of marginalized groups.