Technologyyyyyyyyyyyyyyyyyy
I think it was because we really don't know what exactly happened in the past.
Also, I'm pretty sure people did not keep track of colored people back then.
Because they probably don't know all the mean and hurtful things people can say or do. OR they haven't seen the things of this field so they don't have to worry and cry because maybe they don't have huge muscles like some guy they saw in a magazine.
Answer:
a pull factor is conditions in a country that attract people to move there a push factor is conditions in a country that makes people want to leave there
Explanation: