Canada

My views are shaped heavily by Fanon and the indigenous Algerian struggle against French colonialism.

During the fight for independence from France there were whites that betrayed France to aid the Algerian struggle: hiding Algerian resistance fighters or smuggling guns through check points or staying silent during questioning etc. etc. When white French descendants betrayed France to aid the indigenous resistance, they became Algerian.

When the US and Canada are abolished, it will require whites and other groups to betray whiteness and aid the indigenous struggle. When they do, there won't be a need to "make" indigenous people give whites and other groups use of the land, because many whites and and other groups will earn their place on the land by aiding the struggle. I'm sure there are individuals who truly do want to kill or expel all white people, but they don't really represent a significant bloc and aren't worth discussing seriously.

(It must be said, after Algerian independence the white French descendants mostly fled back to France because most of them didn't want to betray France to aid Algerian patriots. The same will likely happen in the US and Canada, the whites that refuse to aid in the struggle will flee to whatever European countries will take them because they will not want to live here anymore.)