One nation — They were one in David's time, who was a type of the Messiah, and continued so to the end of Solomon's time, whose name includes peace. So when the Beloved, the Peace — maker, the Messiah shall be king, they shall be one again. And one king — The Messiah.
Related Commentaries of Ezekiel 37:22
Ezekiel 37:22
22 And I will make them one nation in the land upon the mountains of Israel; and one king shall be king to them all: and they shall be no more two nations, neither shall they be divided into two kingdoms any more at all: