After King Solomon's death in 930 BCE, the united monarchy fractured into the Northern Kingdom of Israel and the Southern Kingdom of Judah. Key factors:
The ten northern tribes resented the dominance of the tribe of Judah and the centralization of power in Jerusalem.
The north was primarily agricultural and less wealthy; the south benefited from trade routes and commerce.
Jeroboam I established rival shrines at Bethel and Dan with golden calves, rejecting the Jerusalem Temple's monopoly.
Jeroboam, a former official of Solomon, seized leadership of the north to secure his own dynasty.
Egypt and Aram-Damascus exploited the division, interfering in both kingdoms' affairs.
The split endured until the Assyrian conquest of Israel (722 BCE) and the Babylonian exile of Judah (586 BCE).