Solomom inherits Davids throne. High taxes split kingdom into two.

Solomon came to the throne of Isreal after David died, and so built and completed the Temple, that David so wanted to erect himself, but just like Moses wishing to enter into the promised land, it was denied him, as new fresh clean hands were needed for such a task.
Solomon, like David, ruled generally well but the high taxes that he levied kept increasing year by year to keep pace with the spiralling costs of running a world class royal court.
The revenue required to be raised was quite excessive and increased the growing resentment begining to be shown the crown.
This situation wasnt assisted by the importing of foreign wives, the daughters of neighbouring kings and their false worship brought into his household which was permitted by the nuptial agreements for political reasons. Marriages were a form of international treaty binding old enemies together, mutually strengthening their borders, but the core of Isreal suffered by the gradual relaxing of resistance to false worship.
Satan and his demons began to rampage through this previously almost excluded spiritually highly defended land.
David and Solomon had taken kingly rule by man in partnership with God to its zenith, its highest point.
Unfortunately it was to reach its nadir just as rapidly.
When wise king Solomon died, and he wasnt as wise as he thought, if he didnt notice the division his policies and high tax burden, were having on his subjects.
The country soon split into two separate kingdoms, due primarily to the harsh tax levels.

The ten northern tribes which became Isreal went over to Jeroboam, who wasnt of the royal house of David nor even related to the rival dynasty, that of King Saul before him. Jeroboam was in fact just an exiled tax collector.
The Saul clan had been for intents and purposes been eradicated by loyal Davidic courtiers henchmen who aborbed the blame keeping the true beneficiary David whiter than white.

The smaller two tribe kingdom of Judah remained loyal to Davids old house through Solomons son Rehoboam and from the name Judah the term Jews was coined.

The swings of the pendulum, to and throw portray the now confused religious devotion to God one moment, and then full devotion to Ashtoreth and Baal the next, characterising both kingdoms from this point onwards.
The Ten tribe northern kingdom of Israel being more prone to false worship and leading its little brother, the two tribe loyal kingdom of Judah astray, broke with Traditional worship of Jehovah and set up timber phallic poles to the god Ashtoreth with a main temple, including female temple prostitutes, also the worship of Baal proliferated greatly in the northern ten tribe area.
The pendulum swinging back to Jehovah under inspired new prophets such as Elijah and Elisha and brave leaders like Jehu and Josiah.

Judah succumbed and did many similar acts and some far worse introducing male prostitues to very near the Holy Temple precincts and much false worship inside, to Ashtoreth, Baal and Molech, even to the star Refan.
They despoiled land outside Jerusalem in the Hinnom valley with the heinous crime of sacrificing their firstborn children in a fire to Molech the god of good harvests.