How did Indus River Valley civilizations use irrigation techniques? Farmers used irrigation to protect fields from land overuse. Farmers used irrigation to offset flooding and protect crops. Famers used irrigation to manage the water supply for crops. Famers used irrigation to create land for better roads and houses.

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.