Thanks HK. This is the type of information I was seeking. You were right to mention the grade level too. We are looking for something in the 3rd/4th grade level. I am deeply disappointed with world history at this age range.
I noticed Usborne has 2 offerings: "The Usborne Book of World History (Picture World)" and "The Usborne Encyclopedia of World History". Which of these two did you use? I am concerned the first one is a bit young. That being said without seeing any text. There is also an internet linked option now (not sure if it was available back in the day) which I assume points you to more articles/artifact websites.