Asap how can you tell the difference between a primary and a secondary source

Why did the us government remove native americans from the southeast in the 1830s

How did the life of sharecroppers affect their children? children went to school because the farms were small, with little work, children had to work on the farm, so they rarely went to school children learned skilled professions as they worked around the farm. children left home when they became adults because the land wasn't theirs.

What is the relation between the hover dam and the gold rush