Useful Categories

Editor To do: Autosort by number of members, Fix inconsistency in plural and nonplural categories


 * Civilization
 * Conflict
 * Event
 * Excellent Articles
 * Good Articles
 * In Progress
 * Mechanics
 * Meta
 * Organizations
 * Outdated
 * People
 * Religion
 * Settlements
 * Stub
 * Transportation