In 1816, it appeared that John C. Calhoun was a strong nationalist whi

In 1816, it appeared that John C. Calhoun was a strong nationalist while Daniel Webster was a sectionalist looking out for the peculiar interests of New England.

Explain why, only a few years later, the two men had switched; Calhoun to sectionalism and Webster to nationalism.

ANSWER
Calhoun moved toward sectionalism when industry failed to develop in the South; thus, national programs like internal improvements, tariffs, banking, etc. were of little use. Webster moved toward nationalism when investment capital in the Northeast moved from commerce to manufacturing; thus, national programs became valuable to the Northeastern economy.