What was the primary focus of the us foreign policy in decade after ww1

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.

Why is the treaty of paris (1763) important to the age of discovery/exploration?

The land of ordinance of1785 addressed