I want to know the answer to the following question:
What were some of the multi-ethnic confederacies of Eurasia?
All the background I'm provided with is that "According to eastern homeland theory, prior to becoming known to the Roman world, Slavic-speaking tribes were part of the many multi-ethnic confederacies of Eurasia – such as the Sarmatian, Hun and Gothic empires.". Is that enough to answer the question?