This is the second special review podcast from APUSH for ALL, "Nation Building, Expansion & Sectionalism (1800–1848)". The hosts review the transformative period from 1800 to 1848, emphasizing four key themes: expanding democracy, the rise of industrial capitalism, reform movements, and growing sectionalism. They trace political shifts from Jefferson to Jackson, highlighting democratic expansion for white men but continued exclusion of others. The Market Revolution reshaped the economy, spurred immigration, and widened inequality. Religious revival fueled reform efforts, including abolition, temperance, and women’s rights. As the U.S. expanded westward under Manifest Destiny, debates over slavery intensified. The episode ends by urging students to focus on causation, continuity, and comparison for the APUSH exam.