Interned persons may be held in prisons or in facilities known as internment camps, also known as concentration camps. The term concentration camp originates from the Spanish-Cuban Ten Years' War when Spanish forces detained Cuban civilians in camps in order to more easily combat guerrilla forces. Imperialist powers over the following decades continued to use concentration camps (the British during the Second Boer War and the Americans during the Philippine-American War).
The American Heritage Dictionary defines the term concentration camp as: "A camp where persons are confined, usually without hearings and typically under harsh conditions, often as a result of their membership in a group which the government has identified as dangerous or undesirable."
Although the first example of civilian internment may date as far back as the 1830s, the English term concentration camp was first used in order to refer to the reconcentrados (reconcentration camps) which were set up by the Spanish military in Cuba during the Ten Years' War (1868-1878). The label was applied yet again to camps set up by the United States during the Philippine-American War (1899-1902). And expanded usage of the concentration camp label continued, when the British set up camps during the Second Boer War (1899-1902) in South Africa for interning Boers during the same time period.
During the 20th century, the arbitrary internment of civilians by the state reached its most extreme forms in the SovietGulag system of concentration camps (1918-1991) and the Nazi concentration camps (1933-1945). The Soviet system was the first applied by a government on its own citizens. The Gulag consisted in over 30,000 camps for most of its existence (1918-1991) and detained some 18 million from 1929 until 1953, which is only a third of its 73-year lifespan. The Nazi concentration camp system was extensive, with as many as 15,000 camps and at least 715,000 simultaneous internees. The total number of casualties in these camps is difficult to determine, but the deliberate policy of extermination through labor in many of the camps was designed to ensure that the inmates would die of starvation, untreated disease and summary executions within set periods of time. Moreover, Nazi Germany established six extermination camps, specifically designed to kill millions of people, primarily by gassing.
As a result, the term "concentration camp" is sometimes conflated with the concept of an "extermination camp" and historians debate whether the term "concentration camp" or the term "internment camp" should be used to describe other examples of civilian internment.
^Lowry, David (1976). "Human Rights Vol. 5, No. 3 "INTERNMENT: DENTENTION WITHOUT TRIAL IN NORTHERN IRELAND"". Human Rights. American Bar Association: ABA Publishing. 5 (3): 261-331. JSTOR27879033. The essence of internment lies in incarceration without charge or trial.
^Concentration Camp Listing Sourced from Van Eck, Ludo Le livre des Camps. Belgium: Editions Kritak; and Gilbert, Martin Atlas of the Holocaust. New York: William Morrow 1993 ISBN0-688-12364-3. In this online site are the names of 149 camps and 814 subcamps, organized by country.