I give credit where credit is due, and you are due a lot of credit for your very excellent grasp of U.S. history and the correct interpretation of it. (Unlike a few of our other members here but they seem to be unmovably convinced of the righteousness of their perceptions and are unlikely to be easily educated.)
It is absurd to exalt progressivism as producing all that is good, noble, compassionate, and virtuous while completely dismissing or denying that progressivism is at least partially responsible for the increasing divide between rich and poor, responsible for an increasing permanently unemployable underclass, responsible for the breakdown of traditional institutions and values that made the USA the exceptional nation that it is, responsible for unsustainable trillion dollar deficits as far as the eye can see/
Conversely, had we stuck with the undisputable values of the Founders, we could have avoided so many of those negatives.
Some of our friends here reject that our history has any relevance to our present, that the principles that worked in the late 18th and 19th centuries are of no use to us in modern times, and we should avoid discussing the virtues of the hunters and gatherers versus those who clamor for free stuff.
And which "undisputable" values were those? That people with a different skin color could be bought and sold as property? That women had no rights whatsoever? That the people leading this country should only be voted in by White Christian Males with land?
Those values?
This is what I mean about cherry picking. And this is what "progressivism" is all about. It's progressing past the things that aren't worth keeping. It's also the ability to figure out when you are wrong..and what "values" are wrong.
Most of the Founders did not advocate or support slavery, but in order to form a union of all the colonies, that issue was taken off the table during the vote for and ratification of the Constitution that neither specifically protected/supported slavery nor forbade it. It was much like the rigid theocracies that existed in some place. Most of the Founders deplored those, but did not make it an issue when the Constitution was written.
One of the values promoted by the Founders was their faith in a mostly religious and morally centered free people to eventually get around to doing the right thing. And they were right. By around the turn of that century, those little theocracies had all dissolved. Over the next 60 years, through non violent activism, the people pushed for an abolition of slavery which came to a head with the Emancipation Proclamation, the Civil War, and the adoption of the 13th Amendment in 1865. Mind you the vast majority of Americans were ready to end slavery at that time. And so slavery that had existed in American since the 16th century, had been practiced by Native Americans and also the Africans long before that, has now become a distant memory. Now no natural born American, no immigrant, no Native American anywhere would even consider slavery to be anything other than evil and wrong.
The values promoted by the Founders were respect and reverence for life, for liberty, and for a free people, with their rights secured, to pursue happiness in any way that they chose to to do and however they defined what that would be. The values promoted by the Founders is that the people would have their rights secured and would otherwise be totally free to govern themselves and form whatever sort of society they wished to have.
Is that cherry picking?