The culture dies if locals don't have children and the immigrants don't assimilate. There are already many pockets of micro cultures in the US and that's what the people in power are using to divide us already.
I'm increasingly convinced that the goal is to balkanize the US and establish a Network State guided by silicon valley, as described by Curtis Yarvin
The whole modern US culture is literally "immigrants who didn't assimilate" with small pockets of native Americans. From my outsider perspective there is very little common between techie from Valley, NY yuppies and a rust belt redneck. Adding some asians and mexicans just improves your cuisine ;)
I'm increasingly convinced that the goal is to balkanize the US and establish a Network State guided by silicon valley, as described by Curtis Yarvin