Southern jealousy in this regard ultimated inevitably in Southern narrowness, Southern sectionalism, which early manifested themselves in the exclusion from lead in national affairs of Northern public men, reputed to be unfriendly to slavery.

Webster as late as 1830, protested warmly against this intolerance.

Like begets like.

And the proscribing of anti-slavery politicians by the South, created in turn not a little sectional feeling at the North, and helped to stimulate there a consciousness of sectional differences, of antagonism of interests between the two halves of the Union.
Discontent with the original basis of the Union, which had given the South its political coign of vantage, broke out first in New England.
The occasion, though not the cause, of this discontent was, perhaps, the downfall of the Federal party, whose stronghold was in the East.

The commercial and industrial crisis brought on by the embargo, and which beggared, on the authority of Webster, "thousands of families and hundreds of thousands of individuals" fanned this Eastern dissatisfaction into almost open disaffection towards a government dominated by Southern influence, and directed by Southern statesmanship.
To the preponderance of this Southern element in national legislation New England traced her misfortunes.