Escape to north

I read this book, it showed the rigor of slave people. As if there are laws that help them, actually, there are the discriminations. I guess Japanese are tend to judge people by their appearance. Even if they were born and brought up in Japan and if their faces aren't Japanese, we think they are foreign people. I will think so naturally. It isn't discrimination, but I thinks. It contradicts. I guess where the consideration of discriminations will be born.