Classicaly insular thinking from America. Do you not see the divergence that happened with all the same actors at play? Bannon mainly. He led to Farage. We had to deal with him over here and led ultimately to the self inflicted wound you mentioned, and youre right to, its embarassing.
Dont forget the populist wave they all rode in 2016, and Trumps enablers made this.
Brown people bad, borders good. Make everything better by virtue of that.
That is why we are now are dealing with economic decline and yes it was voted for. Idiots here followed what was a directed populist campaign intended at mobilising the chronically ignorant and it worked, for Trump, Farage Bannon, Boris Johnson (who was advised by him too), and others.
Be proud of it lasting 250 yrs by all means, but be ashamed of it now, because its a joke and it wont last another 250 and the way it is carrying on it will lead to the ruination of far better run countries than the US if they persist in half the place supporting someone who tried to start a fucking coup and isnt hiding the fact he will start another