For over a millennium before the 20th century, the Korean state had maintained a system of household registration, or hojok. In the Choson dynasty (1392-1910), these registers, through their specification of each household head's status either as a tax-paying commoner or tax-exempt aristocrat or low-born, reinforced the hereditary status delineation of each locality and in turn determined everything from tax and service obligations to the courtesies and behaviors of social interaction. Within the span of a few years at the turn of the 20th century, however, this stalwart institution of household registration, which proved so central to both the strengths and problems of the Choson government, was thoroughly reorganized, revealing the myriad facets of the state's changing relationship with the populace.