I met 12-year-old Blessing in Bidibidi. She had piercing eyes. She spoke with seriousness well beyond her years. 

She told me she fled to northern Uganda and left most of her family members in South Sudan. 

“As soon as we heard the gunshots, we just ran. That was how I ended up with my aunt. I do not know what happened to the rest of my nine siblings and my parents,” she said. 

Those eyes then flickered and became misty. 

She...