The problem with seeing 1776 as a clean break from the past, though, is that it wasn't; when the Treaty of Paris was signed in 1783, the newly-independent colonies had more or less lengthy histories, during which their social and economic structures had been created by English companies, and those structures remained in place and and determined so much of the new country's future development.
The men who signed the Declaration of Independence, and drafted the US Constitution were leading political and business figures in their respective colonies, and they owed their wealth and power to the way the colonies had been established and governed, and the way their respective economies had developed, before independence -- that's why they were leaders in their communities.
I hadn't really realised this until recently, but I've just finished reading
White Trash: The 400-Year Untold History of Class in America by Nancy Isenberg, and am currently jumping between
End of the Myth by Greg Grandin, a history of the concept of the frontier in American History, and
Stamped from the Beginning: The Definitive History of Racist Ideas in America by Ibrahim X. Kendi.
All three of them tell the same story from different perspectives, and all three of them start it with European colonial powers exploring West Africa, then the Americas, looking for gold and slaves, and then businessmen in London looking to develop colonies in North America for profit, using either slave labour or the English unemployed "idle poor" to bring the land under cultivation.
Looking at US history as part of a continuous narrative, beginning with the foundation of the different 12 colonies, and with the War of Independence as the second act in the drama, casts subsequent US history in a very different light from the way I'm used to seeing it (primarily mediated by American popular culture, I guess, and what I remember from school, where US history is taught primarily as how it impinges British on history).