The foundation of the first modern, stable representative government isn't related to liberalism? I don't understand how you can say such a thing. Surely the actual transition from monarchy (even constitutional monarchy) to pure representative government is worthy of such a categorization. There have been liberal theories based on human rights and equality throughout most of human history, but praise for theories can only go so far when the people who came up with those theories failed to implement them. Even the French failed for a very long period of time... the 1st Republic was a total catastrophe, and France didn't achieve anything approaching a stable representative government until the 3rd Republic.
Not only did the US achieve such a stable representative government 2 years before the French Revolution even began, the government has remained in continuous operation without interruption or major structural changes ever since. Even during the US Civil War, the governmental system was stable enough for the USA to hold a free election in 1864. Even the CSA, with a constitution very heavily based on the US Constitution, was able to hold their own free election in 1861. That alone is major proof of the quality of the structure of the system.
Like I said, the significance of the American Revolution wasn't the revolution itself, it was the government that came out of that revolution. There have been thousands and thousands of revolutions throughout history, and few of those ever contributed to liberalism. The act of rebellion itself is not significant, so identifying 1776 as the date when the American Revolution contributed something important to liberalism is improper. The significance comes from the conversion of that revolution into an orderly and effective system of representative government. Theory is nice, but practical implementation is better.
Honestly, IMO if there's one nation that deserves the most praise for contributions to liberalism, it's England. The gradual development of the English Parliamentary system is absolutely crucial in the foundation of all subsequent representative governments. The only problem with implementing England into the question asked in this thread is that England does not have any clearly defined date on which something significant changed. English government evolved over about 700 years to reach its current form, with many steps along the way. They have no single defining moment of radical change that compares well to any of the dates listed above.
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