Glad you ask. They don’t.

They don't. The genocide and theft of land of their indigenous populations mostly happened less than 150 years ago. That land should be returned to indigenous sovereignty.

How that decolonization should proceed is a question not for the colonizers or their descendents to answer, but the indigenous tribes themselves.

The US probably does not have the right to exist, not the way it was taken. Rectifying that today is an issue of listening to the people who were here first. The Land Back movement is how the country begins reconciling. Israels future, like The USs future should be paved with large amounts of input from the people who were there before the colonizers were.

I dont think the US has the right to exist but I also know Land Back doesn't simply remove the US from existence and the descendents of colonizers aren't going to be exiled. In much this same way I actually agree that Israel doesn't have the right to exist. It doesn't mean I inherently want them gone, it simply means they had no right to take their nation the way they did and they should be listening to the Palestinians, not warring against them. Saying things like Israel does have the right to exist minimizes things like the Nakba and many other horrific acts. These are not acceptable ways to establish countries in modern times, and the world agrees or no one would be trying to stop Russia right now.