What do you call the place where you put interned enemy combatants that have entered your territory? In Sweden we had lots of allied airmen for example, who decided it was better to crash-land in Sweden,
The problem with your theory is that Sweden did not imprison just enemy combatants. It imprisoned noncombatant ethnic Germans, some of whom were in the nation before the war, solely because they were ethnically German. That makes Sweden's camps ethnic internment camps every bit as much as the American ones.
We put these airmen in camps, we called these camps "internment camps". What do you call them?
The US didn't have prisons for combatants when the US was a neutral state. From 1939-Dec 7 1941 (and in the Japanese case, from 1936-Dec 7 1941), Chinese nationalists, Japanese, German, Italian, and UK/Commonwealth military personnel and citizens were free-ranging so to speak. It was only in those nations that collaborated with Germany (Sweden, Switzerland) that being an allied combatant landed you in jail.
After 7 December 1941, German, Japanese, and Italian citizens were deported to neutral states, not imprisoned. German, Japanese and Italian combatants were placed in Prisoner of War Camps (where, among other things, Italians and Germans complimented the US Military for serving them better food in prison than they received when they were active duty Italian armed forces).
What do you call the place where you put your own citizens because they are of a certain ethnicity and because you dont want them in society?
Internment camps. These were used primarily for people of ethnic Japanese descent from the Hawaiian Islands, and from the west coast of the United States. Japanese-Americans in other states were not in general interned unless there were documented connections with Japanese nationalist groups.
No one here's gonna say that locking people up for being Japanese-American was a good idea in general. There ought to have been a good investigative process to pre-screen people prior to internment (or else to follow up after internment). But in Dec-April 1942, fears about what the Japanese military *might* do to the United States were almost as irrational as the options available to a Japanese player in WitP. In Tucson, Arizona, for example, which is 409 miles, two mountain ranges, and one vast stinking desert removed from the nearest usable port (San Diego, California), the local Civil Defense Council crafted a plan to evacuate the local civilian population into the Santa Catalina mountains (no joke), and drilled Civil Defense Wardens on Japanese aircraft recognition, on the theory that somehow the IJA or IJAAF would find a way to roll into or over Tucson in force.
What they'd have done once they'd all "escaped" to the Santa Catalinas beats me. Starved to death probably. But in any case there wasn't an ice-cube's chance in hell that a Japanese *squad* much less an army was going to land in Hawaii, much less Tucson. War hysteria will do that sort of thing.