John Gill Commentary 2 Chronicles 8:2

"that the cities which Huram had given to Solomon, Solomon built them, and caused the children of Israel to dwell there." — 2 Chronicles 8:2 (ASV)

That the cities which Huram had restored to Solomon
Which Solomon first gave to him, but he not liking them, returned them to him, (1 Kings 9:12) ,

Solomon built them ;
or rebuilt them, being very much out of repair, which might be one reason of Huram's not accepting them:

and caused the children of Israel to dwell there ;
they being inhabited by others, the remains of the Canaanitcs perhaps; see (2 Chronicles 8:7) .