Variantly: "When the Most High caused nations to inherit": When the L-rd caused the fearers of sin and the virtuous among the nations to inherit, "when He separated the sons of man": an allusion to Lot, viz. (Bereshith 13:11) "And they separated themselves, the one (Lot) from the other" (Abraham). "He set the bounds of the peoples": R. Eliezer, the son of R. Yossi Haglili, says: It is written (Song of Songs) 6:8) "Sixty are the 'queens' (Abraham and his descendants), and eighty, the 'concubines'" (Noach and his sons until Abraham).
Sixty and eighty are 140 — yet our forefathers descended to Egypt with only seventy souls. "He set the bounds of the peoples": It is not written "the bound of the peoples," but the bounds of "the peoples." The peoples merited taking twice the portions (140) of "the number of the children of Israel" (70).