The Inner Rim was originally just called "the Rim" when first settled by the Galactic Republic in 20,100 BBY during the Great Manifest Period. It was expected to be the farthest extent of the known Galaxy for centuries, but the Expanded Rim (later renamed the Expansion Region) was opened within a hundred years of the Inner Rim. Due to their closer proximity to the hub of galactic civilization in the Core Worlds, Inner Rimmers gradually developed a condescending attitude towards those of the "outer galaxy" but were looked down upon by the inhabitants of the Core and Colonies.