Although many seemingly happy events such as the “Era of Good Feelings” and the granting of universal white manhood suffrage occurred during the early 1800's, the statement that nationalism and not the fear of sectionalism caused westward expansion is an invalid statement. Westward expansion was truly an effect of a growing sectionalism in the country originating from events such as the Tariff of 1828 , the National Bank, and the Missouri Compromise.
Preceding the Missouri Compromise was the Tallmadge amendment. When the Tallmadge amendment was passed, the South was infuriated. The amendment decreed that the slave state of Missouri had to gradually free all of their slaves and prohibited any more slaves to be brought into Missouri before they could be admitted into the Union. This made slave-owning Southerners upset because they viewed the amendment as a threat to sectional equality and balance. With the South suspicious of the North trying to ban slavery and the North suspicious of the South trying to expand slavery, both sides naturally flocked to the West in order to gain another slave or free state to tip the balance of power in their direction. Even in the Florida Purchase Treaty of 1819, after war hero Andrew Jackson exceeded his orders from the White House and tore through Florida, motives for acquiring new land seemed to continually hint towards the growing sectionalism and concern about the issue of slavery. Also, the uneasy Missouri Compromise gave both North and South even more reason to expand westward. The Missouri Compromise established Missouri as a unrestricted slave state which gave abolitionists and Northerners great concern about the spread of slavery while the establishment of the Missouri Compromise line that prohibited slavery above it caused Southerners to worry about slavery too. All the suspicions and fears of the two sections resulted in a fast and furious expansionism in the west. Then, during the