At the close of the Napoleonic wars, Spain, fearing that England, through her desire to keep this trade, would secretly furnish aid to the colonies in their struggle for independence, proposed to the British government to bind itself to a strict neutrality. This England agreed to, and when the treaty was signed, there was, according to Canning, "a distinct understanding with Spain that our commercial intercourse with the colonies was not to be deemed a breach of its stipulations."[47] Notwithstanding this tacit compact, British commerce suffered greatly at the hands of Spanish privateers and even Spanish war vessels. Numbers of British merchantmen were captured by Spanish ships, carried into the few ports left to Spain on the Main, and condemned as prizes for trading with the insurgent colonies. Thus at the time of the acknowledgment of South American independence by the United States, a long list of grievances had accumulated in the hands of the British ambassador at Madrid, and in spite of urgent and repeated remonstrances, remained unredressed. Canning was deterred from making final demands upon the government of Madrid by the consideration that he did not wish to hamper the constitutional government of Spain, which had come into being by the revolution of March, 1820, and against which the other powers of Europe were preparing to act. The condition of affairs on the Spanish Main was, however, critical and demanded instant redress. He decided, therefore, to take matters into his own hands without harassing the government of Spain, and to dispatch a squadron to the West Indies to make reprisals. In a memorandum to the cabinet on this subject, November 15, 1822, in which he outlines his policy, he commends the course of the United States in recognizing the _de facto_ independence of the colonies, claiming a right to trade with them and avenging the attempted interruption of that right by making reprisals, as a more straightforward and intelligible course than that of Great Britain, forbearing for the sake of Spain to recognize the colonies, trading with them in faith of the connivance of Spain and suffering depredations without taking redress. It was not necessary, he thought, to declare war against Spain, for "she has perhaps as little direct and available power over the colonies which she nominally retains as she has over those which have thrown off her yoke. Let us apply, therefore, a local remedy to a local grievance, and make the ships and harbors of Cuba, Porto Rico, and Porto Cabello answerable for the injuries which have been inflicted by those ships, and the perpetrators of which have found shelter in those harbors." In conclusion, he says that the tacit compact, which subsisted for years, by which Spain was to forbear from interrupting British trade with the South American colonies having been renounced by Spain, and the old colonial system having been revived in