A puppet state is a metaphor of a state that is supposedly independent but is in fact dependent upon an outside power. It is nominally sovereign but effectively controlled by a foreign or otherwise alien power, for reasons such as financial interests.
A puppet state preserves the external paraphernalia of independence like a name, flag, anthem, constitution, law codes and motto but in reality is an organ of another state which created or sponsored the government. Puppet states are not recognized as legitimate under international law.
In the Middle Ages vassal states existed which were based on delegation of rule of a country from a King to noble men of lower rank. Since the Peace of Westphalia of 1648 the concept of a nation came into existence where sovereignty was connected more to the people who inhabited the land than to the nobility who owned the land. The term is a metaphor which compares a state or government to a puppet controlled by an outside puppeteer using strings. The first recorded use of the term "puppet government" is from 1884, in reference to the Khedivate of Egypt.
The Batavian Republic was established in the Netherlands under French revolutionary protection.
In Italy, republics were created in the late 18th and early 19th centuries with the assistance and encouragement of Napoleonic France. See also French client republics.
In 1896 Britain established a state in Zanzibar.
During Japan's imperial period, and particularly during the Pacific War (parts of which are considered the Pacific theatre of World War II), the Imperial Japanese regime established a number of dependent states.
Japan had made drafts for other dependent states.