The First Consul afterwards added, "Perhaps it will be objected that the Americans will be found too powerful for Europe in two or three centuries; but my foresight does not embrace such remote fears. Besides, we may hereafter expect rivalries among the members of the Union. The confederations, which are called perpetual, only last till one of the contracting parties finds it in his interest to break them." SUCCESS OF JEFFERSON'S DIPLOMACY. Two days after this conversation Mr. Monroe opportunely arrived, and on the 30th of April the treaty ceding Louisiana to the United States was formally concluded. Mr. Monroe and Mr. Livingston had no authority to negotiate for so vast an extent of territory; but the former was fully possessed of President Jefferson's views, and felt assured that his instructions would have been ample if the condition of France had been foreseen when he sailed from America. Communication with Washington was impossible. Under the most favorable circumstances, an answer could not be expected in less then three months. By that time British ships would probably hold the mouths of the Mississippi, and the flag of St. George be waving over New Orleans. Monroe and Livingston both realized that hesitation would be fatal; and they boldly took the responsibility of purchasing a territory of unknown but prodigious extent, and of pledging the credit of the government for a sum which, rated by the ability to pay, was larger than a similar pledge to-day for five hundred millions of dollars. The price agreed upon was eleven million two hundred and fifty thousand dollars in six per cent United States bonds, the interest of which was made payable in London, Amsterdam, and Paris, and the principal at the treasury in Washington in sums of three millions per annum, beginning fifteen years after the bonds were issued. In a separate treaty made the same day, the United States agreed to pay twenty million francs additional, to be applied by France to the satisfaction of certain claims owed to American citizens. Thus the total cost of Louisiana was eighty millions of francs, or, in round numbers, fifteen millions of dollars. No difficulty was experienced in putting the United States in possession of the territory and of its chief emporium, New Orleans. The French Government had regarded the possession of so much consequence, that Bernadotte, afterwards King of Sweden, was at one time gazetted as Captain-general; and, some obstacles supervening, the eminent General Victor, afterwards Marshal of France and Duke of Belluno, was named in his stead. But all these plans were brushed aside by one stroke of Bonaparte's pen; and the United States, in consequence of favoring circumstances growing out of European complications, and the bold and competent statesmanship of Jefferson, obtained a territory larger in area than that which was wrested from the British crown by the Revolutionary war.