What was a common belief among historians in the early 20th century that makes their sources biased?
A. That slavery is a sacred institution that should be protected from
government interference
B. That Americans can learn a great deal from tribal cultures
C. That women should be encouraged to join the workforce
D. That the interests of white Americans are more important than the
interests of minorities

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