Effective historians must employ a thorough understand of cause and effect. Please select the factors that led to the Great Depression from the choices below.
a) An increase in agricultural production due to abnormally wet weather led to a
fall in prices of farm goods
b) Bombing of Pearl Harbor caused thousands of Japanese to be sent to work
camps
c) Stock market speculation where investors bought on margin but money was
wiped out during the Stock Market Crash
d) President Franklin Roosevelt reduced the power of the federal government to
oversee the economy
e) Bank failures resulted in a huge loss of personal savings

In 911, a group of vikings lead by rollo besieged paris and chartres. after a victory near chartres on 26 august, charles decided to negotiate with rollo. the talks were led by hervé, the archbishop of reims. this resulted in the treaty of saint-clair-sur-epte, which granted rollo and his soldiers all the land between the river epte and the sea. it also granted him brittany, "for his livelihood". at the time, brittany was an independent land which france had not been able to conquer. in exchange, rollo promised the king his loyalty and military assistance when needed. also rollo also agreed to be baptised and to marry gisela, the king's daughter. the territory given rollo is about the same as upper normandy. this would grow to become normandy under rollo's descendants. - wikepedia