Answer:
Because of the racism.
Step-by-step explanation:
At that time, as soon as they were free they stared looking for new neighborhoods to get a safe place to live, It was really difficult at the beginning because they had the mind set that "Black people live in black neighborhoods because white neighborhoods are unsafe". The racism causes that the were slave for a long time and the same racism causes that they weren´t able to find a safer place to live.