The facts take over and the story takes second place. For the reader it will stop the story dead in its tracks. Facts or history have to have a human face. To make it interesting and identifiable to a child or an adult, for that matter. Facts become subordinate to the fiction in the story.
Details become subpoenaed into the characters.
Let your readers do the work. Make his world as real as you can make it through the character and facts. Has to be something human about the story. Even Science Fiction has to be humanized. You can become stuck when dealing with history when you are dealing with narrative.