Everybody came out of East Africa.

The origin of mankind is East Africa. For more information on this please see the Genographic Project  by searching those words online.

We are all related, and we all have greater or lesser amounts of Neanderthal DNA in the bulk of our DNA, (but not in those portions traceable by way of our female or male parentage.

We all live on this earth which has provided our beloved home and different heritages, and we all inhale oxygen, and exhale carbon dioxide, and we all manage to provide ourselves with a certain viable temperature range.  We also rely on food which needs certain specific conditions in which to flourish, and all of which requires water.

So we are all interconnected.