Constitution of the United States
Difficult to amend

Sanford Levinson wrote in 2006 that it has been the most difficult constitution in the world to amend since the fall of Yugoslavia. Levitsky and Ziblatt argue that the US Constitution is the most difficult in the world to amend, and that this helps explain why the US still has so many undemocratic institutions that most or all other democracies have reformed, directly allowing significant democratic backsliding in the United States.
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