For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. -John 3:16
World is not merely nations in this text. Such a distinction, while required in order to prop up the doctrine of limited atonement, is simply not found in the text. What the text does say, however, is that God loves the whole world (without distinction so that we understand God to love all men, as is his revealed character throughout Scripture) in such a way as to give his only begotten son for the same (that is, all men without distinction, elect and non-elect, chosen and non-chosen) and that whosoever will may believe in Jesus and be saved (indicating how one may go from being one of the not-saved to one of the saved or non-elect to elect “in Christ”).
The glory of God here is that God is both willing (so loved) and able (that he sent) to save all men without distinction so that there is hope (whosoever will) for all men.
Curiously this verse does not say that God only loved the elect, only died for the elect, and that only the elect will (through irresistible and forceful changing of a person’s will against their desires/wishes/choice) be saved.