Independence is a condition of a person, nation, country, or state in which its residents and population, or some portion thereof, exercise self-government, and usually sovereignty, over its territory. The opposite of independence is the status of a dependent territory.
Whether the attainment of independence is different from revolution has long been contested, and has often been debated over the question of violence as legitimate means to achieving sovereignty. In general, revolutions aim only to redistribute power with or without an element of emancipation, such as in democratization within a state, which as such may remain unaltered. For example, the Mexican Revolution (1917) chiefly refers to a multi-factional conflict that eventually led to a new constitution; it has rarely been used to refer to the armed struggle (1821) against Spain. However, some wars of independence have been described as revolutions, such as the ones in the United States (1783) and Indonesia (1949), while some revolutions that were specifically about a change in the political structure have resulted in breakaway states. Mongolia and Finland, for example, gained their independence during the revolutions occurring in China (1911) and Russia (1917) respectively. Causes for a country or province wishing to seek independence are many, but most can be summed up as a feeling of inequality compared to the dominant power. The means can extend from intended peaceful demonstrations like in the case of India (1947), to a violent war like in the case of Algeria (1962).
Autonomy refers to a kind of independence which has been granted by an overseeing authority that itself still retains ultimate authority over that territory (see Devolution). A protectorate refers to an autonomous region that depends upon a larger government for its protection as an autonomous region.
Sometimes, a state wishing to achieve independence from a dominating power will issue a declaration of independence; the earliest surviving example is Scotland's Declaration of Arbroath in 1320, with the most recent example being Azawad's declaration of independence in 2012. Declaring independence and attaining it however, are quite different. A well-known successful example is the U.S. Declaration of Independence issued in 1776. The dates of established independence (or, less commonly, the commencement of revolution), are typically celebrated as a national holiday known as an independence day.
Historically, there have been four major periods of declaring independence: