You only got HALF the story right.  What you failed to mention is that Maduro overruled the powers of the elected National Assembly in 2016 which is overwhelmingly controlled by the opposition parties.  He also indefinitely postponed the mayor elections knowing that his supporting socialists parties would all loose.  He also gave himself absolute decree so he can overrule anyone legal authorities and now wants to change the constitution to keep his powers.  What you say is no comparison to what is happening in the US.