South Sudan, the youngest state in the world, is a battered country.  On July 9, 2011, the hope aroused by its independence, which arose after decades of struggle, was enormous.  Ten years and a civil war later, the country is experiencing one of the worst humanitarian crises in the world.
                
                    
                                        A cross around his neck, green and black scarf on his head, Tireza Sima looks…