Why have most of the large countries in the world adopted a federal form of government?

To provide a more effective representation for all, country primarily adopt a federal form of government. In order to listen to the voice of the people, the United States has a federal form of government.

 

The compound or mixed mode of government, being combined with a general gov’t   and regional gov’ts is a mono political system is called Federalism.

Fergus Millar argued that Rome had a democratic model of government. Some instances were: Roman citizens voted on proposals put forward by magistrates, the Roman Senate was an advisory body to magistrates elected by the people, and that suffrage was a privilege enjoyed by male Roman citizens.