After the war of independence, the American government formulated a series of rules to help develop the unoccupied areas. What rules has the government made?

After the American War of Independence, the government formulated a series of rules, including the Constitution, laws and policies, to help develop unoccupied areas. For example, the western expansion act aims to expand the territory of the western United States and provide support for immigrants and companies to expand their borders. In addition, the U.S. government has formulated other policies, such as contract law and land inventory law, aimed at promoting land development in the western region and ensuring that immigrants and enterprises abide by ethics and legal norms when developing land in the western region.