Your definition is also off.
The OP had it right with their definition of American Exceptionalism.
In human history, The United States of America is the first country founded with the concept of inherent human rights and a government that is intended to protect those rights, as opposed to providing wealth/power to the governing body.
By that definition that claim would have to go to England 500 years before the US were founded. Although one could argue the Provisions of Oxford were about civil rights as was the Magna Carta.
The idea of human rights is quite a bit older. A lot in fact. The first thing that springs to mind is the rule of Cyrus the Great. Even if the major philosophical underpinnings of how we understand them today were done in the Age of Enlightenment they still remembered that one.
The US is only the first country where it stuck to some extent. With the caveat that you'd better be rich and your skin had the right hue. The idea was there but the execution was a bit half-assed.
If that is supposed to be the basis of the US Exceptionalism then it does disregard a couple of thousands of years of human history, the history of the US and only reinforces the profound fact that it is puerile nonsense.
Sorry I meant 'founded on' not 'founded with'.
At any rate, the Anglo-Saxons, including Saxonified Britons, progressively spread into England, by a combination of military conquest and cultural assimilation, until by the eighth century some kind of England really had emerged.
Not quite the same as
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.--That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed,
Yes, this builds on lots of ideals and attempts tried previously, but the US of A is the first nation *founded* on these principles and encoding them in the very structure of our government, as opposed to lots of nations that discovered them to be valid and then tried to fit that in with their existing governmental structures.
(admittedly, some of the structures put in place to limit the government seem to be failing these days, but that was the intent)
If you can identify a single other nation so founded before 1776, please point it out to me.
I would even be interested in a list of nations so founded since 1776, as I suspect they exist, but I am not certain of that, and the potentials I come up with do not seem to actually fit.