Transportation Infrastructure: The physical structures (like roads, bridges, canals) that were built or improved upon during the early 19th century to facilitate travel and trade.
Market Revolution: A period of rapid economic transformations in the United States during the early 19th century that expanded markets and increased opportunities for commercial growth.
Social Movements: Collective efforts by groups of people striving for social change or reform. In this context, expanding opportunities allowed for the rise of various social movements advocating for equal rights and democratic reforms.