Answer: Marbury v. Madison: denied the Supreme Court the right to rule on the constitutionality of laws
Answer:
Primary source.
Explanation:
As this particular piece of literature was written by Fredrick Douglass himself, it is considered a primary source.
As per source of: https://libguides.ithaca.edu/research101/primary
"A primary source provides direct or firsthand evidence about an event, object, person, or work of art."
To ensure that their facts that they are studying are correct.