What different roles might local citizens have in government decision making under a unitary system a federal system and a confederation

Unitary government:
1) Citizens elects a party into power. The head of the elected party will become the Prime Minister.

Federal system
1) Citizens elect their leaders by voting said individual to the position he/she is vying for like President, Senator, Governor, Representatives,etc.
2) Citizens are free to run for government office providing they pass the requirements of such position.
3) Citizens can veto the bill that the legislation is reviewing. They can write to their representative and state their reasons why they are against the passing of the bill..

Confederate
1) Citizens role are limited. 
*There aren't many online articles about citizens' role in a confederate government.

Ba rock that formed 1,400 million years ago!

Nswer iceland is one of the most active volcanic regions on earth