It's one example. And yes, they traded people from what is now Poland and Eastern Europe, while also mixing with other Eurasian groups as far south as Italy. Human trafficking, invasions, trade, migrations, and many other engagements mixed ethnicities around the world, for 150,000 years. Europeans are defintiely mixedas are others around the Mediterranean. Perhaps you want to consider only recent generations. The US is a perfect example of the intermixing of ethnicities, or also Brasil.