They would offer free land to the people who came to the west
For independence because Britain was taxing the colonists too much, was passing too many acts oppressing the colonists, and even killed some colonists (Boston Massacre).
Monroe Doctrine is the best known U.S. policy toward the Western Hemisphere. Buried in a routine annual message delivered to Congress by President James Monroe in December 1823, the doctrine warns European nations that the United States would not tolerate further colonization or puppet monarchs.