I need help, pls i don't get it

One of the person important products for britain's manufacturers was

What deadly disease cost many workers their lives before dr. william gorgas found a treatment?

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.