Tribes reproduce as the people who make up the tribe reproduce.
Values reproduce as the people who hold them reproduce, plus as others adopt those values, minus as those who hold those values drop them.
But the US was supposed to be a country where values mattered more than tribe. "We hold these truths to be self evident", and all that, and if you accepted the values, you belonged. That was an imperfect ideal, but it was the ideal until rather recently. I'm not sure to what degree it still is.
Are we ever allowed to stop being a "values country" and just be a normal one? Or are we at least allowed to change our values? Are we allowed to make that decision for ourselves?
If you want to change values like "equal rights" and "rule of law", you may be able to do so, but you probably have to amend the constitution to do it.