A federation (Latin: foedus, foederis, 'covenant'), also known as a federal state, is a political entity characterized by a union of partially self-governing states or regions united by a central (federal) government. In a federation, the self-governing status of the component states, as well as the division of power between them and the central government, are typically constitutionally entrenched and may not be altered by a unilateral decision of the latter.

The governmental or constitutional structure found in a federation is known as federalism. It can be considered the opposite of another system, the unitary state. Germany with sixteen Länder is an example of a federation, whereas neighboring Austria and its Bundesländer was a unitary state with administrative divisions that became federated, and neighboring France by contrast has always been unitary.

Federations may be multi-ethnic and cover a large area of territory (e.g. India), although neither is necessarily the case. The initial agreements create a stability that encourages other common interests, brings the disparate territories closer, and gives them all even more common ground. At some time this is recognized and a movement is organized to merge more closely. Other times, especially when common cultural factors are at play such as ethnicity and language, some of these steps in this pattern are expedited and compressed.

The international council for federal countries, the Forum of Federations, is based in Ottawa, Ontario. It helps share best practices among countries with federal systems of government, and currently includes nine countries as partner governments.

Read more about Federation:  History, Internal Controversy and Conflict, Federal Governments

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... The American Federation of Labor (AFL) was one of the first federations of labor unions in the United States ... of the Cigar Makers' International Union was elected president of the Federation at its founding convention and was reelected every year except one until his death in 1924 ... While the Federation was founded and dominated by craft unions throughout the first fifty years of its existence, many of its craft union affiliates turned to ...

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