Read 2 Chronicles 8:8 Using Other Translations
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.
from their descendants who were left after them in the land, whom the people of Israel had not destroyed--these Solomon drafted as forced labor, and so they are to this day.
These were descendants of the nations whom the people of Israel had not destroyed. So Solomon conscripted them for his labor force, and they serve as forced laborers to this day.