Please help me with this Take a look at the following letter written by Abraham Lincoln. What indicates that it is a primary source?

The quest for wealth or was a major factor contributing to the age of exploration? grants god gold glory

How are the republican and democratic presidential candidates chosen? a. they are nominated by their state governments. b. each is nominated by his or her respective party. c. each is chosen by the governor of his or her home state. d. they are chosen by the house of representatives.

Why did the dakota sioux start an uprising in 1862? a.the government had not followed through with promises of . b.the government had given to an enemy american indian group. c.the sioux were not allowed to sell hunted animals to the us government. d.the sioux had made an agreement with neighboring tribes to attack.