Administrative boundaries rarely remain stable over time, yet quantitative economic history often treats local units as fixed. As a result, mergers, splits, and redefinitions can generate spurious breaks in historical series and bias long-run analysis. We introduce a general method to construct \emph{time-consistent territorial units} (TCTUs): municipalities are represented as nodes in a dynamic network linked by documented events, from which stable aggregates can be extracted for any user-

Tag-uri: Italia