Help me Caused a statement where neither the Allied nor the central powers could advance
there's a machine gun, tank, trench warfare, u-boat, battleship chemical weapon, gas mask airplane

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

Indigenous peoples were introduced to horses and the wheel, while europeans learned of many previously unknown plants.