I believe the answer is Religion
They faced massive drought cattle death and a very nasty case of the black plauge
One example would be economic opportunities. The possibility of a better job would pull someone to a new country. Hope that helps!
It was "Mikhail Gorbachev" who was <span>known as a reformer and initiated radical new reform policies, setting the stage for the dissolution of the Soviet Union. </span>
Each of these events and actions dealt with the extension of slavery into the western territories. The Missouri Compromise (1820) banned slavery 36 degrees latitude. The Compromise of 1850 allowed for popular sovereignty (voters decide) in the Mexican Cession territory.
