Which point of opposition to mr. madison’s war was the most significant to growing sectionalism ?

In the winter of 1814-1815 New England Federalists gathered in Hartford, CT to hold the Hartford Convention. This was a meeting for those who opposed Madison's War, better known as the War of 1812, and wanted to enact change in Washington for the many wrongs and complaints they had. Most of these came out of fears of being overpowered by southern and western states. This was a prime example of growing sectionalism as the end of the Federalist Party neared.