The illustrated dictionary linked below shows how the governments of unitary, confederation, federal, parliamentary democracy, presidential democracy, and several more work.
https://docs.google.com/presentation/d/1kEIl4XHj3AMtWaRoFtsOi7DHSXI63b8fnwqQ0czVeJM/edit?usp=sharing
https://docs.google.com/presentation/d/1kEIl4XHj3AMtWaRoFtsOi7DHSXI63b8fnwqQ0czVeJM/edit?usp=sharing