In the immediate aftermath of the War of 1812 there was a distinct sentiment among the people and politicians.

In the immediate aftermath of the War of 1812 there was a distinct nationalist sentiment among the people and politicians.

Explanation:

The War of 1812 was a war between Great Britain and the United States of America from June 17, 1812, to February 17, 1815.   British historians generally consider war to be part of the Napoleonic Wars, but historians in the United States see it as a second war of independence.

This war, started as a consequence of the British abuses against the rights of the American sailors, reaffirmed the independence of the United States and stopped these abusive behaviors by Great Britain. The union of American society against the enemy, the victory over the great world power, and the establishment of full sovereignty over the territory of the nation together generated a high nationalist sentiment, which came to confirm the sovereign and anti-British positions of the inhabitants of the United States of America.

where is the section with the question?

this isn't a question and if you're going to list things be kind and use commas.