I think it helps to remember that all humans share common ancestry. While there are certainly cultural and biological differences around the globe today, these are the tip of the iceberg, the distant branches of the tree. Under the surface, at the roots, the distribution of people across the globe owes itself to a long, gradual process of migration — or several migrations — during which time some differences arose (along with the interbreeding with neighboring groups that maintained similarities). 

The animation below illustrates some of the major migrations of people across the world over the past 200,000 years, reminding us of our roots and shared connections. Some of this is already out of date. For example, a recent study suggested that modern humans may have reached China by 100,000 years ago, much earlier than suggested in the video. But the point still stands — no matter where they live today, all humans can trace their lineage back to the same place.