If Europe is largely cleansed of Europeans, and is filled with Africans and Central Asians, is the land no longer ours? Is it African and Central Asian land?

If these Africans and Central Asians eradicated the European population and completely crushed the European civilization, repopulating this land with their own people instead, then yes, in this scenario it would be right to call them the masters of Europe.

but the land that its on is not ours in a more spiritual sense

Do you think Turks believe that their land doesn't belong to them? If not, what's the problem with the U.S., except for dozens of years of propaganda about 'muh stolen land' and 'muh poor native americans'?

I empathize strongly with the plight of the native populations as have been displaced and persecuted much like we will be in the coming years.

You're comparing apples and oranges. Gaining land via right of conquest was a standart practise of all human civilizations, and it only started to be viewed as 'uncivilized' after WW2. Amerindians were crushed by a superior civilization and were powerless to prevent it, while what we currently observe in all Western countries — not only the U.S. — is Europeans, guided by the treacherous elites, voluntarily surrendering to the hordes of non-whites and inviting even more of them to leech off their societies.