Which statement was not a responsibility of a knight?
a knight conducted himself according to a code of behavior known as chivalry. a knight had to undergo a special training program which included academic studies.
knights fought in war campaigns for their kings or lords.
knights were rulers of duchies.

Knights were NOT rulers of providences or lands. The Dukes and other titled lords were land owners.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.