Expansion Region / Legends The Expansion Region , first known as the Expansion Rim , was located between the Inner Rim and the Mid Rim in the galaxy . History . The region was an experiment in corporate - controlled worlds settled during the Galactic Republic ' s Great Manifest Period beginning in 20 , 000 BBY . Unrelenting exploitation by Corellian and Duros / Neimoidian corporate interests of the worlds of the Corellian Run had impoverished countless native species and contributed to environmental despoliation . Galactic colonization was forced to shift farther eastward towards the Perlemian Trade Route . Looking for untapped resource - rich worlds , the two galactic powerhouses Alsakan and Coruscant sponsored the exploration and settlement of the future Expansion Region . Competing economic interests between Alsakan and Coruscant led to the First Alsakan Conflict in 17 , 000 BBY which ended the economic boom of the Great Manifest period . Over the following millennia , the competing holdings of both worlds fought seventeen " Alsakan Conflicts " in the Region . The conflicts devastated many Alsakan colonies while slavery boomed due to the entry of Hutt , Trandoshan and Bothan slavers . Only the Corellian Run escaped the conflict due to the strong presence of Corellian military warships , which precipitated further colonization west of the Run . Gradually , the western portion on the region became a mixture of prosperous agrarian , industrial and trading worlds known collectively as the Trailing Sectors . The widespread prosperity of this region funded Coruscant ’ s colonization of the Mid Rim worlds . The Brentaal League extended its hyperlanes into the Region in 4020 BBY . The last Alsakan Conflict ended in Coruscant ’ s favor in 3017 BBY and sealed its monopoly over galactic colonization efforts in the ensuing period . For another millennium , the eastern Slice sectors recovered but were devastated by the New Sith Wars and the Candorian plague during the Draggulch Period ( 2000 — 1000 BBY ) . Many colonies were abandoned as the Republic retreated into the Core Worlds . Following the Ruusan Reformation , the Republic granted a conglomerate of powerful corporations known as the Expansionist Oligarchy control of the Outer Expansion Zone . These corporations exploited and profited heavily from the raw materials , metals and ores of many worlds . While profits were enormous for these corporations , the region was plagued by internal strife and disturbances . Inhabitants were oppressed while the corporations stripped entire stellar systems of all their resources . Because they controlled communications and transportation to , from , and across the region , very few people knew what was going on in the Expansion Region . With civil unrest spreading from system to system , the Republic eventually took control of the Region due to mounting pressure from its denizens by limiting or evicting corporate interests . Though most of those corporations moved on to the Corporate Sector in 490 BBY , Expansion Region worlds were still producers of raw materials and ores . However , most natural resources were exhausted . During the Imperial Period , the Galactic Empire attempted to revive the Slice sectors by developing several key regional centers like Gyndine , Bacrana and Cyrillia into depot stations for civilian and military fleets and encouraging colonization of surrounding systems by corporations and laborers . The Corporate Sector Authority also aided in the development of several subsectors and controlled the Enarc Run until the Battle of Endor . During the Galactic Civil War , the Rebel Alliance established several bases on depopulated systems . Following the withdrawal of Imperial forces to the Outer Rim Territories following the collapse of Operation Shadow Hand , the Alliance ’ s successor state the New Republic tried rebuilding the region but was interrupted by the Yuuzhan Vong War . Though Yuuzhan Vong agents succeeded in stirring conflict between Osarian and Rhommamool along the Corellian Run , much of the region escaped the war . Behind the scenes . According to an email from Jason Fry , the Essential Atlas Online Companion ' s next update would feature a sector map of the Expansion Region . Such an update eventually occurred in late October of 2012 .