Final answer:
After slavery was abolished, northern states implemented discriminatory laws and practiced segregation towards African Americans.
Step-by-step explanation:
After slavery was abolished, northern states had different ways of regarding African Americans. Firstly, they implemented discriminatory laws known as Black Codes, which restricted African American's rights and freedoms. Secondly, they often practiced segregation, separating African Americans from white communities in schools, public facilities, and housing.
Learn more about Northern states' treatment of African Americans after slavery