The American Revolution is often seen favorably in comparison to the French revolution. The American revolution succeeded in establishing a constitutional republic with limited suffrage, a bill of rights and separation of church & state while France went through a reign of Terror followed by a series of dictatorships before ultimately regressing back to monarchy.
However in many ways the French Revolution was much more ambitious in it's ideals than the American revolution. Revolutionary France decriminalized homosexuality, abolished slavery (ultimately leading to Haiti's independence), instituted universal male suffrage, created & standardized the metric system, metric time and the Republican calendar. They even had a black member of the legislature, in the 18th century! The US by contrast, left slavery untouched (and actually continued the practice for another 30 years after the British had abolished it), extended the franchise only to a small minority of propertied men, didn't legalize homosexuality in some states until 2003 and still hasn't adopted the metric system.
So the question is, what POD could have resulted in a more radical American Revolution? I've seen TLs where the American revolution is more conservative, such as Washington becoming King (ala Napoleon), but not one where the American revolution is more radical, more Jacobin, more revolutionary.