What are the four nations that occupied remaining Indian lands?

The four nations that occupied the remaining Indian lands are the United States, Canada, Australia, and New Zealand. These countries, through various means such as treaties, military conquest, and colonization, significantly diminished Indigenous territories and often marginalized Indigenous populations. Each nation has a unique history of interaction with Indigenous peoples, leading to different outcomes regarding land rights and sovereignty. Efforts for reconciliation and recognition of Indigenous rights continue in these countries today.