Final answer:
Nationalism after the War of 1812 played a significant role in shaping American culture, with the Era of Good Feelings reflecting national unity, and nationalist policies leading to economic and political democratization.
Step-by-step explanation:
The surge in nationalism after the War of 1812 was significantly responsible for the growth of a truly American culture. Following the war, the United States witnessed a tremendous wave of national pride, as exemplified by Francis Scott Key's 'Star-Spangled Banner'. This period also came to be known as the Era of Good Feelings, indicative of the sense of unity that prevailed. Political and economic transformation played essential roles as the country moved towards market revolution—uniting local, regional, and national interests. The counselors' efforts in promoting a stronger economy and various Supreme Court decisions were in agreement with the Constitution—adding to national coherence and enhancing the federal government's role.
The rise of nationalist policies also contributed to the development of American culture. A majority in Congress supported the federal government’s role in economic matters, which led to infrastructure and financial development such as the Second Bank of the United States, and the establishment of a tariff system. These efforts furthered economic independence from Europe, fostering a unique American economy. Additionally, Supreme Court cases like McCulloch v. Maryland and Gibbons v. Ogden strengthened federal authority, reinforcing national unity.
Democratization and an increase in political participation also played a role. Most states expanded voting rights beyond property owners, which doubled the number of white men voting, turning the democratic sentiment into a tangible cultural force. As American men became more politically active, their involvement reflected the shift from a republic led by elites to one where the populace had a greater voice. This shift in political culture was another aspect of developing American identity.