This is a pretty sorry list, because it contains zero structural changes in our government for two hundred years. Seven of the amendments extend rights or freedoms making us more democratic. The rest are procedural.
Lately, we have been discussing the Polis which as we have seen was an dynamic and adaptive political system over 350 years. The Roman Republic experienced a conflict of the classes from 509 B.C. to 287 when Lex Hortensia was adopted. The Republic continued on for another 200 years before it collapsed. Changes in the Republican government were dramatic: whole new legislative bodies were added, new magistracies created, and rights to govern extended to the Plebian Class.