The kingdom tears in two
When Solomon dies, his son Rehoboam goes to Shechem to be made king, and the northern tribes come with a single, reasonable request: lighten the heavy yoke of taxes and forced labor your father laid on us, and we will gladly serve you. Rehoboam consults the elders, who counsel mercy — then ignores them for his young friends, who counsel cruelty. His answer is a boast: where his father used whips, he will use scorpions. The ten northern tribes turn their backs — every man to his own tent — and the united kingdom of David and Solomon is gone in a single afternoon.
From here the story splits. Israel (the north, ten tribes) takes Jeroboam as king; Judah (the south, with Benjamin) keeps the house of David, Jerusalem, and the temple. Tellingly, the writer frames even this rupture as something within God's sovereign hand — a consequence of Solomon's own turn to idols — while never excusing the human pride and folly that caused it. A kingdom is lost not on a battlefield but in one arrogant word.
Then comes the north's founding sin. Jeroboam reasons that if his people keep traveling south to worship at the Jerusalem temple, their hearts will return to the house of David. So he makes two golden calves, sets one at Bethel and one at Dan, and presents them as the gods who brought Israel up out of Egypt — a deliberate, damning echo of Aaron's calf at Sinai. He invents a counterfeit priesthood and festival to match. For the rest of 1–2 Kings, king after northern king is measured against "the sin of Jeroboam... who made Israel to sin." The fracture was political; the deeper wound was a hollowed-out, do-it-yourself worship that would rot the north until it fell.
