abstract:In law, an enemy alien is a citizen of a country which is in a state of conflict with the land in which he or she is located. Usually, but not always, the countries are in a state of declared war.
"This kind of thing" included the incarceration of 1,800 Japanese,1,500 Germans, as well as smaller numbers of Italians and other Europeans at Fort Lincoln during the war years, under the Alien Enemy Control Program.
VOA: standard.2010.06.22
"XCOM: Enemy Unknown" is a science fiction, strategy game pitting Earth against an invading alien force.