Answer:
The mass migration of Muslims and Hindus. (C.)
It was after the Battle of Antietam
<span>Nixon's Southern Strategy won the support of "southern white" voters, since this allowed the Republican Party to take back these voters who had previously been democratic. </span>
Chinese Rebels overthrew the Mongols
I believe the answer is Gold.
Gold was a very hot commodity at that time because before we use paper/digital money like today, Gold was made as material to make a type of money with more intrinsic value.
The abundance of this natural resources led to many European empire came and started their colonization in AFrica.
