They stop the Germans advance in Stalingrad
The Thirty Years' War (1618-48) began when Holy Roman Emperor Ferdinand II of Bohemia attempted to curtail the religious activities of his subjects, sparking rebellion among Protestants.
Slavery helped out the class structure in the South by helping people become more dependent and more supportive of what they need.
Answer: The Bubonic plague is estimated to have killed 30-60% of the European population of the time.
Explanation: