The third of these issues was that of the tariff. Commercial relations between Cuba and the United States were naturally intimate and important to both countries, and afforded scope for almost endless discussions concerning and manipulations of tariff duties. It was in the power of the United States to enhance or to depress the prosperity of Cuba, by the adjustment of tariff rates. To admit Cuban sugar, not to mention tobacco, freely or at a low duty, into the American market meant prosperity for the island. To place a high tariff rate upon it meant hard times if not disaster in Cuba. During the period between the Ten Years' War and the War of Independence in Cuba, such tariff changes very seriously affected the economic and also the political condition of Cuba; and the final withdrawal of the reciprocity arrangement which had opened American markets to Cuba was one of the chief provoking causes of the final revolution in the island. That revolution would doubtless have come, in any case, but it was measurably hastened and exacerbated by the economic distress which was thus precipitated upon the island, and against which it was realized there could be no assurance until Cuba was an independent nation with full power to regulate and control her own commerce and her own economic system. Even then, as we shall see, for a time the island was involved in economic distress because of the unwillingness of certain sordid interests in the United States to perform the most obvious and indisputable moral duty of that country toward its neighbor. There are few passages which the friendly historian must more regret to record in the story of Cuban-American relations than that of the delay of the American Congress to enter into proper commercial reciprocity with Cuba as soon as the independence of that island was established. * * * * *