What was the purpose of the Indian-American wars

What made the settlement of oklahoma territory different from that of other territories

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

What is the main inference that can be drawn from adam smith’s book the wealth of nations?