The crusades from Europe believed that Jerusalem (the holy land) was theirs, while the Middle Eastern countries disagreed, leading to battles and attacks in the northern part of Jerusalem.
Germany's made a nonaggression agreement with the Soviet Union before WW2 in order to ensure the Soviet military would not interfere with the German invasion of Poland.
Five key factors that eventually led to the convening of the constitutional convention would be the war debt of the US, Shay's Rebellion, the Whiskey Rebellion, a lack of oversight over the states, and the Federalist Papers.
Answer:
workers and farmers defaulting on mortgage
