Please help How did Thomas Jefferson’s purchase of the Louisiana Territory affect relationship with the Native Americans?

Which is the best example of a primary source ducument useful in the study of history ?

Who believed that the best economic system was one in which businesses compete to gain profit with minimal or no government control? a.thomas hobbes b.john locke c.adam smith d.jean-jacques rousseau

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.