The interesting but profitless field of speculation might be exhausted in imagining the result if the United States had thus linked herself to the Spanish Americas in an American alliance. The problem of securing the trade of those republics, which has occupied the attention of many statesmen since that day, might have yielded to this solution; but that any permanent alliance could have been made between peoples of antagonistic temperament and varying ideals of self-government is far from likely. Many times since then the growing American spirit has demanded that Uncle Sam should become the policeman of America; but the narrow escape in this instance from incurring such an undesirable task leads to the hope that it will never be assumed. Leadership in the "let us alone" policy was taken by the United States as the result of her geographic isolation, as well as her centrality of location. She was nearest to the new republics and had most to lose. Eliminating Canada as a British possession and Brazil with an enervating climate and Latin leadership, the United States was the only power whose size and resources entitled her to speak with authority on the question of European interference. The Monroe doctrine was primarily intracontinental and for immediate self-preservation; secondarily it was extracontinental and for ultimate self-preservation. England, the only European New World power remaining of the six whose discoveries originally entitled them to that distinction, was equally interested in the preservation of Canada and the freedom of trade which the independence of the Spanish-American republics made possible. She rejected the Holy Alliance to support the Monroe doctrine. Without British co-operation it is doubtful whether the stand could have been maintained and the Holy Alliance held in check. This cooperation brought about a speedy _rapprochement_ between the two recent enemies. It was hastened by the diplomatic skill of Gallatin in arranging for a joint occupation of the region west of the Rocky Mountains commonly known as the Oregon country. By the treaties of 1818 and 1827, final decision was delayed until increasing population should aid in deciding ownership.