What made Ming dynasty fall was multiple of factors. Such as lack of silver, a series of natural disasters, peasant uprisings, and finally attacks by the Manchu people.
well they werent allowed to do many things but maybe "vote" is your answer
All of them conducted their work assignments separate from white soldiers, received medical treatment from separate blood banks, hospitals, and medical staff, and socialized only in segregated settings. If they left their stateside bases, they often experienced hostility from local white civilian communities.
They couldn't really earn freedom but they wouldn't run away, they had protection and shelter where they were so they wouldnt run away because they were scared of being attacked