The pentagon papers is a report of the Department of Defense detailing the involvement of the United States' military on Vietnam from 1945 to 1967. The papers were first brought to public by the New York Times in 1971. The papers showed that the Johnson administration had lied about the scope of its actions in the Vietnam War.
Answer:
D. Government interference that lowered crop values
Because of the weakness of non-states (ones that werent official, just groups of people who called themselves states), and European powers had strong econimies and a well organized government. Hope this was useful :P
First, it was a very cool climate in the early fourteenth century when the crop failure happened. Also, irregular lengthy rain patterns killed the crops very fast.