A speaker once commented Eretz Canaan is only called “ours” (Eretz Yisrael) in Scripture once we were banished…
The obvious explanation: Hashem’s names are meant to encourage us to keep mitzvos. Originally, we were to keep in mind to kill all the inhabitants, not to be influenced by them, and not to emulate them, so we do not share their fate. Then, we were to recall, seek and reacquire our heartland and habitat, the only place we can serve Hashem effectively.