When the Republic's power and influence expand, many new areas of the galaxy are incorporated into the Republic. The Core and Colonies are the base of the Galactic Republic. A reorganization of senatorial representation occurs 1,000 years prior to "Star Wars" during the Ruusan Reformation. The most common organization for these new territories is to group regions into Sectors of about 50 inhabited worlds. Each sector is represented by a Senatorial Delegation. When the number of sectors becomes too large, sectors are organized into roughly a thousand regions, each represented by one delegation to the Senate.