The Unconquered Land and Eastern Inheritances (Joshua 13) August 22
Not all of the land was conquered in the previously described wars. There were still sections, such as the land of the Philistines in what is now known as the Gaza Strip, which the Israelites did not yet possess.
The land was divided among the tribes, but not all of the Canaanites were driven out. More details are given in the book of Judges (see Judges 1). So, too, are some of the reasons for God not driving them out (compare Judges 2; 3:1-6). The Israelites lacked the diligence, zeal and spirit to obey God, and God used the Canaanites to test them. In fact, the entire book of Judges is a chronicle of Israel's failures in this regard. Many victories (e.g., Jerusalem, 2 Samuel 5:6-10) waited 400 years until the days of David.