It depends on how this is being presented. First grade is the time for memorization of facts so that the student has pegs upon which to hang future knowledge. In our home school, children as young as 4 memorize the timeline of history, focusing on the major events included above.
Sixth grade here. Too complex and too foreign for first-graders. Most of them are very concrete thinkers at that age and anything they say about how a civilization evolves will be mere parroting.