D) It describes the event as it was experienced at the time.
African Americans protested in the streets against discrimination.
Answer:
A) It created rules for how new states could join the country.
Explanation:
If you look it up, you will see that the Northwest Ordinance outlines the process on how new states can be admitted into the Union, and have equal rights that the first original thirteen states have. This helped to establish stable government in the new territories of the Northwest.
I may be wrong, but I believe this would be the answer.