HURRY In the United States, the Second Industrial Revolution lasted from
the end of the American Revolution to 1800.
the end of the American Revolution to 1850.
the end of the Civil War to 1900.
the end of the Civil War to 1950.

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

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