I gather that you find that argument convincing, but I suspect it's because you already accept the conclusion. To someone who does not already accept your conclusion, your argument is not likely to be very convincing.
> Do you think some people are born as subjects?
Yes, they are. Look at history; even look around today. It's not right, it's not moral, but it clearly is true that it happens.
I agree with you that people have inalienable or natural rights. However, I claim that your position does not give you an adequate basis for believing that. And your position certainly does not give you an adequate basis for persuading anyone who does not already accept it.
Perhaps I expressed this badly in my previous post, but that's what I'm trying to say.
Great. So what's your reason?