Why don’t these 10 million people belong?

Why don’t these 10 million people belong? We are looking at a city like any other, these are the people who’ve in the city, they live work and play freely thanks to their rights. Everybody except him. He is imprisoned by an invisible barrier. His crime - being stateless. That means he is not a citizen of any state. With citizenship he could enjoy all he rights most of us take for granted. But for a stateless person that is impossible. In the world today there are over 10 million stateless people - lega