Why would a researcher use a primary source instead of a secondary source when analyzing a historical event?

Business people who received land grants to recruit new settlers to the area were known by what term

Leah deposited $50,000 in the bank. three years later, she borrowed $40,000 for a new truck. from this description, which is the most accurate statement?

Which action by the us war department angered chief red cloud to the point that he refused to sign the treaty of fort laramie ? a) the killing of buffalo by the united states troops b) the appointment of troops to the powder river basin c) the burning of parts of the powder river basin d) the murder of chief red cloud’s wife