The authors succeed in showing the many ways that humanity has always been on the move, for religious reasons, for economic reasons, for political reasons, against their will, and/or despite the obstacles in their way. While they attempt a broadly chronological narrative, they prioritize following the developments in a particular region and time period. This, combined with an arbitrary order for the sequence in which different regions of the world get covered, makes for a less than clear overall picture. However, the narrative does shine in highlighting the many contributions from different peoples to major global centers across time.