A state of anarchy exists when a country has no effective government.

In an anarchy ['ænɚki], there is no body to make decisions or enforce the laws.

An autocracy is the simplest form of government.

In an autocracy [ɔ'tɑkrəsi, the government is controlled by a single individual, known as the autocrat.

Whether or not an autocracy is successful depends on the character and ability of the leader.

In an oligarchy  ['ɑlə'gɑrki] a small group of people controls the government.

Membership in this group often depends on family connections, wealth or military power.

In a republic, individuals are elected to represent the citizens.

The power of the government in a republic is limited by a constitution.

A constitution is a written document that makes the rule for a government to follow.

This limits the power of the government.

A constitution defines the relationship between the government and its citizens.