John Gill Commentary Deuteronomy 12:29

"When Jehovah thy God shall cut off the nations from before thee, whither thou goest in to dispossess them, and thou dispossessest them, and dwellest in their land;" — Deuteronomy 12:29 (ASV)

When the Lord your God shall cut off the nations from before
you
The seven nations of the land of Canaan, (Deuteronomy 7:1) ,

where you go to possess them, and you succeed them, and
dwell in their land ;
or to inherit them, and you do inherit them, by dwelling in their land.