One uncontested value of the Revolutionary era was a commitment to economic opportunity. To achieve this, people migrated in large numbers, and the United States dramatically expanded its boundaries: first, by conquest, pushing west to the Mississippi River; then, by purchase, all the way to the Pacific Ocean. Northern merchants created a banking system and organized rural manufacturing. State governments used charters and other privileges to assist businesses and to improve infrastructure. Southern planters used slaves to grow a new staple crop — cotton. Many yeomen farm families moved west to farm; and Eastern laborers worked in burgeoning manufacturing enterprises. By 1820, the young American republic was on the verge of achieving economic as well as political independence.
Even as the borders of the United States expanded, its diversity inhibited the effort to define an American culture and identity. Native Americans still lived in their own clans and nations; black Americans were developing a distinct African American culture; and White Americans were enmeshed in vigorous regional ethnic communities. Over time, political institutions began to unite Americans of diverse backgrounds, as did increasing participation in the market economy and in evangelical Protestant churches. By 1820, to be an American meant, for many members of the dominant white population, to be a republican, a Protestant, and an enterprising individual.