AHC: America adopts a parliamentary government

Your challenge is to get the United States to adopt a parliamentary style of government with a PoD after 1791. Extra points if one is adopted through a second constitutional convention.
 
We had a thread very similar to this recently, only without your specific POD. It may be useful to you.
 
Check out the "Whig Presidency" thread. There's a discussion there about a PoD just after the civil war that leads to a semi-presidential system (which might eventually become parliamentary).
 
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