how do these topics contribute to a greater sense of independence and nationhood?

how do these topics contribute to a greater sense of independence and nationhood? a.) Louisiana Purchase
b.) Embargo
c.) War of 1812
d.) John Marshal Supreme Court decisions
1. McCulloch V. Maryland
2. Dartmouth College V. woodward
3. Gibbons V. Ogden
e.) Adams-onis Treaty
f.) Monroe Doctrine


just a brief explanation on any would help thanks!!