There were still people left from the Hittites, Amorites, Perizzites, Hivites and Jebusites (these people were not Israelites).
NIV
All the people who were left of the Hittites, Amorites, Perizzites, Hivites, and Jebusites, who were not of Israel
AMP
As for all the people that were left of the Hittites, and the Amorites, and the Perizzites, and the Hivites, and the Jebusites, which were not of Israel,
KJV
As well as Baalath and all his store cities, and all the cities for his chariots and for his horses – whatever he desired to build in Jerusalem, in Lebanon and throughout all the territory he ruled.
NIV
And Baalath and all the store cities [he] had, and all the cities for his chariots and the cities for his horsemen, and all that Solomon desired to build in Jerusalem, in Lebanon, and in all his dominion.
AMP
And Baalath, and all the store cities that Solomon had, and all the chariot cities, and the cities of the horsemen, and all that Solomon desired to build in Jerusalem, and in Lebanon, and throughout all the land of his dominion.
KJV
Solomon conscripted the descendants of all these people remaining in the land – whom the Israelites had not destroyed – to serve as slave labor, as it is to this day.
NIV
But descendants of those who were left in the land, whom the Israelites had not destroyed--of them Solomon made a levy for forced labor to this day.
AMP
But of their children, who were left after them in the land, whom the children of Israel consumed not, them did Solomon make to pay tribute until this day.
KJV