Neighboring country to Kelowna and the Andari Federation on the planet Langara, Terrania formed an alliance with the Andari after generations of warfare. Kelowna believed it was a prelude to a joint attack on their own nation, and used a naquadria bomb against them. The three nations met together for peace talks, and after the threat of invasion and occupation by the Goa'uld Anubis, formed a tenuous peace administered by the Joint Ruling Council.
Meridian - SG-1 visits Kelowna, and learns that they are developing a naquadria bomb to potentially use against Terrania and the Andari.
[https://www.gateworld.net/sg1/s6/shadow-play/ Shadow Play - Its weapon completed, Kelowna threatens to use it against Terrania and the Andari, who have united against them.
Homecoming - Terrania joins the negotiating table for peace talks after the Kelownans drop a devestating naquadria bomb, but Anubis soon occupies their world. The Terranians steal naquadria from their allies, the Andari, in the hopes of appeasing the Goa'uld.
Fallout - Terrania sends Vin Eremal, its representative on the Joint Ruling Council, to Earth to negotiate the relocation of their people -- but learn that a team led by Jonas Quinn has averted the planet's doom.