Umm.. well if you look at it biblicly all languages are linked, thiers a core human language that they all rooted out from during the tower of babyl... and then you have that time when the jewish warrior nations fell and were captured and enslaved which ended in their being some arabs among their bloodlines and then them finally leaving the middle east thousands of years ago except for like Israel.
And those tribes that left supposedly went south, to africa proly the tip of it and then east through southern asia, to japan for some, and up the coast then splitting off and the remainders either going up and left through russia to spread out their and in scandinavia an along the coast while the other half of that remainder had gone right, across the supposed landbridge to alaska and through out canada, america, central america, and south america.
A common remark to be made is to mention the high cheek bones common in the native americans, finns, and japs. i said finns an japs not in insult, just... caus i like saying it....
and then with the finnish language they spent a few thousand years as the chess board between sweden and russia, not to mention having thier culture constantly screwed with, and struggling to repair the language even though it was nearly killed out several times, so thiers obvious damage to meanings their not to mention finally writing it down.
O.K., the japanese with the more or less same language suffered less damage to it... its pretty simple plus finns adapted to other cultures and had to have fluid use of their language and adapt to others meanings.
Eh. Scattered to the corners of the earth. Pretty simple idea.