What does Ezekiel 37:19 mean?

tell them, “This is what the Lord says: I’m going to take Joseph’s stick, which is in Ephraim’s hand, and the tribes of Israel with him, and join it to Judah’s stick. I’ll make them one stick, and they’ll be one in my hand.”' Ezekiel 37:19 - Modern Text Bible

(God explains that he will reunite the divided people of Israel into one nation under his care.)