All of these countries were built on stolen land.

Pretty much, yes. Historically any strong nation or significant group of people conquered the lands of others and subjugated the people. Indigenous natives in north central and south America did it to other indigenous natives. Whites did it. Blacks did it. Asians did it. So forth and so on.

Basically the whole world was stolen

How many countries, other than the USA, gave land back to the indigenous people they “stole” from?