It says ויתן להם ארצות גוים בעבור ישמרו חוקיו the land of other nations were given to them (us) to keep Hashem’s laws, so if we don’t keep the Torah, the land is not ours. The first Rashi says that Hashem took it away from the kenanim and gave it to us on the condition that we keep the Torah otherwise what makes us better than them?
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