Law 19983 on

Constitutional Monarchy:  The highest authority of state is a king or a queen. Usually hereditary. Monarch’s power is limited by the Constitution and the law. King or Queen has little authority is government is in hands of a president.

Republic: The head of state is an elected president that changes periodically through elections. It is mainly a representation post. It represents the country in public ceremonies, etc… but has no power at all.

Autocracy/Despotism: It is the government by a single person who has unlimited power and also the citizens have nothing to say in the government.

Absolute Monarchy: The highest authority of the state is a king or a queen. Usually hereditary. The king or queen has absolute power and citizens have nothing to say in the parliament.

Oligarchy: The government is in the hands of a few people, usually a rich group or a dominant clan.

Dictatorship: The government is in the hands of a single leader. The leader uses force to keep control and he is usually supported by the army. Citizen’s rights are very few and depend on the will of the leaders.

Totalitarian: It is a regime with only one political party that holds all the powers. The party supports a leader that act as a dictator. People have few right. They use the army to maintain power and they celebrate fake elections.

Anarchy: Is a situation in which there is no government at all, it believes in people organizing themselves without the guidance of the government. It is also when a country doesn't have a government because of a Civil War or coup d’etat.

Revolutionary: Is a temporal government established by a group after overthrowing a previous government and after a short period this may change into a new type of government (republic, etc…)

Centralised: The decisions are taken by a National Parliament and a Central Government or by the Central Government in non-democratic states and affect the whole country.

Decentralised/Federal:  The central governments shares power with regional and local governments. The central governments establishes the basic structure and legislation and the regional and local governments make modifications and implement decisions.

Capitalist/Liberalism: The government does not interfere in economy regulated by the market laws (supply and demand). Basic idea is that people can cover their needs with their wages of their work . And most western countries are neoliberal although they provide public services

Communist/Socialist: The state interferes in everything. It controls economy and own most of business and banks of the country. The objective is to provide people their needs. It also gives little initiative or entrepreneurship.