Open Me! For more features and versions of this video visit us at: https://www.edyoutoo.com/videos

This video is designed for kids, please respect our young audience in your comments.

The dates for these groups vary greatly depending upon the source, so materials you're studying may not match up. We used dates that were from current materials we trust and we include what some sources call "preclassic" periods as the beginning of civilizations.

Poll at 8:58 asking what you'd like to see next.

Our website includes more caption options than YouTube, an interactive transcript and three versions of every video. Every video has the Standard version, a Simplified English version and a Watch and Read option. Watch and Read has no narration and allows for a better caption reading experience, viewers can watch the animation and read the captions separately and teachers and learners can also narrate the video for themselves using the captions. We release new videos on https://www.edyoutoo.com/videos first, before YouTube.

If you're embedding this video behind a paywall, we're looking at ways to prevent companies from doing this in the future. Our community post explains more:    / @edyoutoo