Because everyone is born as a man and have the same equal rights, so the differences of skin color, it's just it's external factors which could not be valued in the evaluation of each person.
Because everyone is born the same and equal rights. So the difference of skin color, it's just an external factor which it can not assess the value of each.
Because everyone was born as human beings, and are equal. So the difference of skin color, it"s just the external factors which cannot appraise in each person.