The purpose of this study is to examine the overland trade with northern Mexico as international trade, to analyze its unique role in the economic development of both New Mexico and Missouri, and to evaluate the influence of Mexican gold and silver on the economic development of Missouri. The economic development of the United States between the beginning of the Revolution and the Civil War was attended by uncertainty, risk, and experimentation. The United States was exceedingly poor in specie, had almost no liquid capital, and its international credit rating was not well established. The United States currency system was based on paper money in contrast to that of New Spain and Mexico.Chapter I discusses the vagaries of a paper currency sy...