So as individuals we choose to fly the flag a lot.
Which values? "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness." does not seem to be upheld very strongly in the USA.
What about women's rights and abortion upturned by the current government, why are Black Lives Matter protests against police brutality needed 50 years after Martin Luther King, what about thousands of people disappeared by Trump's ICE, what about the enormous wealth inequality where the wealthy seem to be a lot more 'equal' than the plebs, what about nobody being punished for the 2008 financial crisis or the Epstein events or the Jan 6th attempted coup? Or the unwillingness of so many people to wear masks during COVID out of respect for their fellow Americans?
How can you claim a "core kernel of universal shared values" without nation-wide universal health care, workers rights, liveable minimum wage, things that demonstrate a fundamental belief in equality and shared values??