That’s the way I read it too. A set of values ethics and beliefs when viewed objectively, are uniquely American. I’m starting to doubt that such a set can be defined.
LOL funnily enough as an outsider, the same thought occurred to me. You guys really like putting your flag on everything (fire hydrants!). I can’t think of any other nation which does this.
Good work. 
Not all of us. In fact, one of my more distant cousins got in trouble for burning it.
Good point!
yeah and that too!
I haven’t yet seen a biggie: the sanctity of human life (even though we argue over when that should be considered to begin, and whether the government should have the right to end it.)
True, but certainly not everywhere. For example the value of the sanctity of human life is not universal, nor is the equality of women.
Mostly, the OP’s question sounds more like a statement in a political rally than a philosophical one. However, one thing that is very common in the US is a belief that the US has shared values and that the US is special. Like Twain (who was not a fan of nationalism), I question that one. Color me skeptical. 
BTW, as an American traveling abroad some decades back, there was a difference between English-speaking people and Americans I’d run into. It’s hard to put my finger on it, but Americans as a general rule are very outgoing and upbeat – maybe a bit too much for some folks. After being among mostly Canadians (in the pubs), Northern Europeans (on the trails), and Aussies and Kiwis everywhere, it was a lot of fun – and rather different from usual – to happen on a group of Americans and spend the evening playing Charades.
Of course, I also saw plenty of Americnas who didn’t like things because it wasn’t like home. Like the high-toned lady I was behind line in at the bank teller window at 2AM (yes, 2AM and it was open) in Papeete. She asked the guy all kinds of questions, but all he did was change her money and ignore the rest. She turned to me and said, “My God, aren’t these people rude!” Totally without realizing that she was the rude one, treating the person behind the counter like an information machine, never making any attempt to acknowledge him as a human being in a job he probably resented, and totally oblivious to the local custom to ignore people when they were being rude. It’s a rather civilized custom, too, once you get used to it. When I noticed I was being ignored, that was a clue I was being rude. When I figured out how and corrected it, they pretended the rude stuff never happened! Bingo! Too bad it’s not a custom here.
Americans treat being ignored as rude. That’s something we tend to have in common! But I fear it’s not quite what we can call a shared value.
We just watched the PBS show, “American Masters” about Carl Sandberg. One of the comments (I’m paraphrasing from a spotty memory) was that Sandberg voiced the feelings of the American people. As they were discussing this, it occurred to me that there is no longer a “voice of the American people.” We’re a divided nation, call it Democrat and Republican if you will, with very different values. Even such basics as “freedom of speech” and “freedom of religion” divide us nowadays.
IMHO: Probably we are mostly united in terms of placing more emphasis on individual responsibility than on group responsibility, compared to other nations. We are also pretty much agreed that power is conferred upon individuals by the nature of the office they hold, rather than being inherent in the person/family. And the country pretty much measures “success” by material accomplishments, rather than intrinsic goals. And we tend to place value on the letter of the law rather than the spirit of the law.
People have noted in other threads that the Danes are even more proud of their flag than we are of ours. I think what’s more unique is the US attitude to the flag: there are all sorts of rules about what you can and can’t do with it, like letting it touch the ground. I don’t think any other country bothers with such things, except in the context of the military and official functions.
Hrrumph…Roman Cult Of The Eagle…<Slips back into nap>
And don’t get me started on the Norwegians.
They apparently are proud also of their erect penises. I’ve even heard musical tributes. A strange folk.
I daresay every American know of a group of Americans who don’t deserve to be American.
I would agree with freedom of speech, including freedom of the press, and rule of law. We may all jump all over every person accused of a crime, and suggest vigilantism, but that - I think - is just venting a little rage.
Wrong.
Wrong.
Absolutely. No matter how much people bitch about grocery stores with signs in languages we don’t understand, we surely love the food they sell. We also love to brag about the cultures of our (great) grandparents. And the food they brought here.
I am an American and it is my right to hear at least one language I can’t even recognize every day. And twice on week-ends.
And then eat.
I think this is the practical difference between “presume” and “assume”.