Inner Colonies

The Inner Colonies were the first worlds terraformed and colonized by the Unified Earth Government, relieving the overpopulation pressure on Earth that resulted in the Interplanetary War in the 2160's. Collectively, Earth and the Inner Colonies are known as the core worlds.

For a list of notable Inner Colonies, see here.

History
The Inner Colonies consisted of the 210 planets which were colonized during the UEG's first wave of colonial expansion between 2362 and 2390, starting with the launch of the Odyssey and its colonization of the Epsilon Eridani system. Although volunteers for the colonization programs were plentiful due to Earth's deteriorated conditions, interstellar travel was still highly expensive and, as a result, the settlers of the Inner Colonies were subjected to rigorous physical and mental screening. This also led to the Inner Colonies being viewed as humanity's elite. As the UNSC began settling the Outer Colonies, the Inner Colonies, with their established social and economic infrastructures, became the political and economic basis of the UNSC, supplied with raw materials from the newer settlements. By 2490, Reach, one of the first extrasolar colonies, had become the UNSC's military center.

It is known that there was a war some time before the 26th century called the Inner Colony Wars. Little is known about this conflict, except the fact that unrestricted news reports during the war caused "massive civil unrest" and threatened to "tear down Earth's culture".

During the Human-Covenant War, numerous ships were pulled from their positions in the Outer Colonies to defend the Inner Colonies. Old ships, such as the Halcyon-class light cruiser, were refitted and brought back into service to supplement the remaining defense forces. At the beginning of the Fall of Reach, dozens of Inner Colony planets were bypassed by the Covenant fleet attacking Reach, and a number of Inner Colonies survived the war.