Why the United States Constitution is Unique?

Things in England have been the same for hundreds and hundreds of years. The King or Queen is the figurehead while the Prime Minister and Parliament run the nation. The have a House of Lords and a House of Commons. There is no written document. There is not system of checks and balances. Common law is the way the judicial system works. Those our nation's fathers fled from for religious freedom were used as a point of inspiration and influence. Yet, somehow, our constitution turned out to be unique.
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