Hiram, the king of Tyre and a good friend of David's, sends his servants to congratulate Solomon on his new gig as king.
Solomon responds with a big idea: "My dad wasn't able to build a temple to God because he was busy fighting enemies on all sides his whole life. But the Lord told him that I would build it, and since Israel's at peace, I think I'll get started. Since you guys are the best lumberjacks, what say you provide the cedar lumber we need?"
Hiram thinks that's a great idea, so he provides cedar and fir lumber in exchange for tons of wheat and oil. Thus, a great timber partnership is born. And there is much rejoicing.
As temple construction ramps up, Solomon conscripts thousands of forced laborers to harvest and cut timber and quarry and cut stone. He's not messin' around.