What are the major purposes of governments and how do governments enforce their decisions?

Coordinate National Defense - The protection of its people against attacks by other nations or from terrorism

Protect Human Rights - Laws are made and enforced to preserve individual rights and preserve peace and order

Provide Public Goods - Example of these are transportation infrastructure. This kind of service are beneficial to the people of the nation, yet it becomes hard or ineffectual if privatize

Pursue National Interests - The will of the people is represented by the government