"What is it with the Koprulu Sector, anyhow? It seems like every week there's another skirmish, insurgency, sortie, planned offensive, counter strike, police action, border conflict or plain old-fashioned war breaking out. While the chaos and anarchy are great for a spacefaring merchant vessel that's willing to transport certain cargo of questionable legality, I sometimes have to stop and wonder if this madness will ever end."
The Koprulu sector—nicknamed the Terran Sector— is a sector in space colonized by terrans and protoss, with some later incursions from the zerg. It is situated on the galactic fringe of the Milky Way, sixty thousand light years from Earth. During the Guild Wars, the sector was divided into at least five zones. Most of its planets are inhospitable, and at least compared to other areas of the galaxy, the sector is sparsely populated. Still, the sector offers a vast range of foodstuffs.
War in the sector is a brutal affair. Life expectancy for terran soldiers once measured in mere seconds.
With the arrival of humanity in the sector, it was noted that the sector had been inhabited, or at least graced by alien species, given the prevalence of lifeforms that appeared to have been formed artificially. But by the time of terran settlement, while the Koprulu sector featured an extensive range of flora and fauna, no sapient species inhabited it.
The Morians had benefitted from having the largest resource mining operations in the sector. Wanting to maximize their ability to drain the resources from the numerous worlds within the sector, as well as fearing that the Confederacy might attempt to move in and use its military strength to regulate their lucrative operations, the Morian Mining Coalition and the Kelanis Shipping Guild merged to form the Kel-Morian Combine. Tensions rose between the Confederacy and the Combine leading to the outbreak of the Guild Wars in 2485.
For the next four years, Kerrigan's Swarm was the dominant force in the sector. Intermittent fighting continued between the end of the Brood War and the start of the Second Great War even as the powers withdrew to recover. The Swarm refrained from overt hostilities against the terrans and protoss, and engaged only in occasional skirmishes. The Khalai struggled to recover from the loss of Aiur while attempting to reunify their society with the Dark Templar. It was a difficult transition for both sides, and the name Raszagal was invoked more than once to keep the peace. Interacting with the Dark Templar and xel'naga temple led to many new developments as the protoss prepared for continuing the war with the zerg. The protoss power bloc became known as the Daelaam.
In 2504, Kerrigan launched an invasion of terran space in an effort to obtain the scattered pieces of the Keystone, which would eventually be collected by Raynor's Raiders. The invasion ended in a Dominion attack on Char. Through the artifact, Kerrigan was made human again causing her broods to scatter throughout the sector. Commander Jim Raynor recovered Kerrigan and brought her to the Umojan Protectorate. After being separated from Raynor and convinced that he had been killed by Mengsk, Kerrigan returned to the zerg. After re-uniting the zerg and becoming the primal Queen of Blades, she invaded Korhal, killing Mengsk and ending the conflict. She then departed, seeking to defeat the resurrected xel'nagaAmon.Valerian Mengsk succeeded Arcturus as the new monarch of the Terran Dominion.
The Koprulu sector was a battlefield during the End War as Amon unleashed the Golden Armada in a bid to eradicate all life from the sector. The war ended with his defeat. In 2508, scientists reported a regrowth of life on previously barren worlds within the sector.
Years after the End War and Defenders of Man Insurgency, peace appeared to have settled over the sector. However, in reality, battles waged among terran, zerg, and protoss forces, even while their leaders were more cordial.