1 Kings 9:20

"As for all the people that were left of the Amorites, the Hittites, the Perizzites, the Hivites, and the Jebusites, who were not of the children of Israel; their children that were left after them in the land, whom the children of Israel were not able utterly to destroy, of them did Solomon raise a levy of bondservants unto this day. But of the children of Israel did Solomon make no bondservants; but they were the men of war, and his servants, and his princes, and his captains, and rulers of his chariots, and of his horsemen."

While true enough that the soldiers and other `servants' of Solomon which were drawn from the Israelites themselves were not called "slaves"; they most certainly were required to serve Solomon, and it was only a matter of time and opportunity until that civilization, much as Israel loved it, was doomed to failure, as are all cultures that are supported and sustained by slave labor and unscrupulous oppression of the poor. The remnants of the Canaanites were slaves, and the Israelites were Solomon's servants, a distinction without much difference.