By 1840, how much cotton did the United States produce per year because of changes in technology? about 3,000 bales
about 300,000 bales
about 1.3 million bales
about 1.3 billion bales

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