This essay aims to introduce an issue of the RHE-JILAEH dedicated to the reconstruction of historical trade statistics of Latin American countries. It comments on the early perceptions of the quality and utility of historical trade statistics and on the way in which more recent analyses have overcome the distrust that prevailed until the last third of the 20th century. It then summarises the different criteria and methodologies that have been used to assess the accuracy and reliability of trade statistics in order to make them useful for the purpose of reconstructing new, more complete and precise trade series or re-estimating those available. The introduction ends with a brief description of the contents of this volume.

In 1821 Mexico achieved its independence from Spain. What happened in the following 50 years has become a field of dispute for economic historians. The lack of reliable quantitative information in many fields of economic activity has led to contrasting interpretations, none of which has been accepted as definitive. The aim of this paper is to reconstruct the yearly values of Mexico’s foreign trade in that period, with the purpose of providing elements to start filling this significant gap in Mexico’s historiography. It relies on official trade statistics and consular reports from Mexico’s main trading partners. It provides new series of imports and (commodity and specie) exports, and a provisional view of the balance of trade for most of the 1821-1870 period.