1 Solomon was king over all Israel.
1 Kings 4:1 Cross References - NSB
2 Samuel 5:5
5 In Hebron he ruled Judah for seven years and six months. In Jerusalem he ruled for thirty-three years over all Israel and Judah.
1 Kings 11:13
13 »Still I will not take the entire kingdom from him. I will give one tribe to your son, because of my servant David, and because of Jerusalem, the town of my selection.«
1 Kings 11:35-36
1 Kings 12:19-20
1 Chronicles 12:38
38 All these men came in battle array to Hebron with the single purpose of making David the king of Israel. In fact, all Israel agreed that David should be their king.
2 Chronicles 9:30
30 Solomon ruled in Jerusalem over all Israel for forty years.
Ecclesiastes 1:12
12 I, the Preacher, was king over Israel in Jerusalem.