<span> President Lincoln rescinded Fremont's emancipation proclamation, fearing it might push other Border States (slave states loyal to the Union) into the Confederate camp. Staff corruption, opposition from Missouri’s influential Blair family, and military defeats caused Lincoln to relieve Fremont of his command on November 2, 1861.</span>
The opium wars ended with China losing money and a colony.
Many people believe that the collapse of the Indus Valley Civilization was caused by climate change.
I believe the answer is A. Unchecked immigration.
Because they wanted their own freedom/independence
