There is a lot of Bible left, and the dream kingdom of Solomon had to end sometime.
This chapter details Solomon’s faults, punishment and death.
His fault was marrying too many wives, 700 and 300 concubines to boot. Most were foreign and as he aged they turned him onto their own Gods. This was despite Jehovah having appeared to him twice.
God spoke to a rebel, jeroboam, through a prophet with the punishment that after Solomon’s death the kingdom would be split, with Solomon’s part being just 2 tribes. He ran to hide in Egypt until Solomon’s death, which came after 40 years.
Additionally, some of the neighbouring countries that Solomon near annihilated started to get strong again.
So Solomon dies with the kingdom set up to fall apart. The mercy God shows, keeping a remnant of the davidic kingdom is on behalf of David. We know that this is part of the meta plan of salvation, the line of David, a failure by earthly terms, but hanging on by a thread for God’s purpose.
Solomons kingdom saw the fullest flowering of the promised land promise they would ever know. It really was a blessed land flowing with abundance, admired by other nations. But they blew it by not staying faithful to Jehovah. We, humans, unaided, always will.