Meanwhile the Spanish question became more critical. As time went on Spain grew less instead of more settled, while the ultra-royalist party gained strength in France. To them the position to which the Bourbon King of Spain had been reduced seemed at once an insult and a menace to France. The establishment of Austrian supremacy in Italy made them long for French supremacy in Spain. In August, 1821, the presence of yellow fever in Spain was made the occasion for establishing a body of troops, professing to act as a sanitary cordon, upon the frontier. They were retained there when the fever had disappeared, and their numbers were gradually raised to 100,000. In December, 1821, an ultra-royalist ministry entered on office in France under the leadership of Villèle. Villèle, like King Louis XVIII., was opposed to war, but he might easily be forced to adopt the war policy which was popular with his party. Fresh evidence was given of the contagious nature of the Spanish revolution by the adoption, on the 27th of the preceding June, by the Portuguese cortes, of a constitution modelled on that of Spain. Six days later the Portuguese king arrived at Lisbon and was induced to sign the new constitution. This event was the more significant in the eyes of the powers, because the proclamation of the constitution had been accompanied by an insult to the Austrian embassy. If Spanish liberalism placed Spain in danger of a war with France, Spain was in equal danger of a war with Great Britain because she was not liberal enough. The revolution of 1820, instead of reconciling the revolted colonies, had served as an example to the loyal colonies to seek their liberty. By the summer of 1822 Upper Peru was the only part of the American mainland where Spain held more than isolated posts; she had been compelled to sell Florida to the United States, and San Domingo had joined the revolted French colony of Hayti. The Spanish cortes, however, were even more resolute than the king had been to maintain the authority of the mother country, and protested against the right which the British had claimed and exercised of trading with the revolted colonies. The disorderly state of these colonies encouraged the growth of piracy, which flourished even in the ports which still acknowledged the supremacy of Spain. Special irritation was caused in 1822 by the condemnation of the _Lord Collingwood_ for trading with Buenos Ayres, a place over which Spain had exercised no authority for twelve years. In the same year the new navigation acts greatly increased the facilities for trading with Great Britain enjoyed by such places in America as admitted British ships. In April, 1822, the United States recognised the independence of Colombia, but Great Britain refrained as yet from recognising any of the Spanish-American states, partly because of their unsettled condition and partly because the threat of recognition was a valuable diplomatic counter in negotiations with Spain.