Representative Democracy is the answer you are looking for
Explanation:
charlemagne United his empire through reforms
Mostly the U.S.'s leaders were still in an "isolationist" country. The regular German would've left to serve in the Germany army.
Answer: a system of government by the whole population or all the eligible members of a state, typically through elected representatives.
Another meaning - a state governed under a system of democracy, control of an organization or group by the majority of its members.