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The Eastern Coalition, or "ECON", was a faction in Earth's Third World War which, during the conflict, launched attacks on the United States.

In 2063, approximately ten years after the end of the war, Lily Sloane assumed that the ECON was resuming their attacks when a Borg sphere from the future opened fire upon Zefram Cochrane's launch facility in central Montana. Later, while aboard the USS Enterprise-E, Sloane demanded to know which faction Captain Jean-Luc Picard belonged to, although he assured her he wasn't a member of the Eastern Coalition. (Star Trek: First Contact)

A coalition of nations in the Far East and/or Middle East would seem to be suggested by the name of this combatant. It was later explained by Brannon Braga, in the film's audio commentary, that the ECON was at one time simply "China," but that it was changed in favor of political correctness.
The Eastern Coalition was described by the Star Trek Encyclopedia (4th ed., vol. 1, p. 228) as "a loose alliance of eastern powers" which "was often adversarial towards the powers controlling North America."

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