The people of Manasseh were not able to defeat those cities. So the Canaanite people continued to live there.
The Israelites had not been able to destroy those people. But Solomon forced them to work for him as slaves. They are still slaves today.
The army of Judah was not able to force out the Jebusite people living in Jerusalem. So today there are still Jebusite people living among the people of Judah in Jerusalem.