The working together of political opponents during the aftermath of the war of 1812 was a sign of the
panic of 1819
american system
era of good feelings
necessary and proper clause

The working together of political opponents during the aftermath of the War of 1812 was a sign of the Era of Good Feelings. The Era of Good Feelings was a time period in American history where there was a sentiment of national purpose and a desire for unity after the Americans came out victorious from the War of 1812 and finally felt fully in charge of their own country. 

Ithink it’s c , good luck on whatever : )