What caused 12 million + immigrants to travel to america from 1892 to 1954?

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.

answer; a variety of simple organic compounds could be spontaneously synthesized from components in earths primitive atmosphere;

answertwo stimuli;