I don't know how the black African first humans got to Europe, but the European part of the human race is said to have arisen in approximately the area of Poland. Linguists reach this decision because some of the words that modern-day languages share deal with natural objects from that part of the world. The only one I can recall off the top of my head is берёза/birch, a tree that grows in the north.
The Indo-European languages reach from England to India. One of the major divisions is based on what happened to the word for 'hundred'. The IE languages developed along two lines, in one line the initial consonant became a k or h, in the other line it became an S. Slavic, Sanskrit, Hindi - I think all these are the so-called Satem languages, whereas western Europe are the Kentum languages. (There was a further sound shift in the Germanic branch where the K became H.)