Cahokia was destroyed in part by floods and what man-made factor?
a. a rival city's invasion after damming the river

b. the irrigation canal the cahokians had built

c. the fact that maize was planted too close to the riverbank

d. the cahokians' stripping the forest of trees to build an interior wooden fence

What was the main point of helen hunt jackson's book, century of dishonor? a.it showed how unfairly american settlers were treated by the us government. b.it proved that american government was not responsive to the will of the people. c.it made the point that free land was no longer available to new settlers out west. d.it outlined the poor treatment of the native americans by the government.