During the industrial revolution, how did innovations in technology affect the use of slave labor in the united states?

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.

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Why did federalists fear the louisiana purchase? what did they think would happen?