The document discusses the growth of the United States following the American Revolution through several key events and developments: 1) Independence helped the US grow both in population and territory as it expanded across North America over the 1800s. 2) The Second Great Awakening religious revival in the early 1800s spread Protestant values like work ethic that encouraged growth. 3) The Monroe Doctrine of 1823 established the US's stance against European colonization in the Americas and helped newly independent Latin American countries.