The period following the war of 1812 was called the "era of good feelings" because:

One of the leading journals promoting the philosophy of the Era of Good Feelings was Niles Weekly Register, founded in 1811. Hezekiah Niles believed strongly in the American national purpose and his publication, supported entirely by subscriptions and carrying no advertising, was highly influential at the time. 

It developed as a reaction to the impact of european colonialism in africa on peoples of african descent. in the  mid-20th century, activists in africa adopted pan-africanism as a rallying cry for independence from colonial rule. some african pan-africanists sought to unite the continent as one independenthope it was useful