The sterling pound was the currency of international exchange. There the richness of the world was congregated. But, no longer beginning of century XX, crises, conflicts and vanities politics prenunciavam storms in the horizon, nor always blue. The European countries, for not obtaining to conciliate interests, finish for if involving in a world-wide confrontation that, practically, ended this ' ' Belle poque' '. The benefited country more was the United States.
Already in the turn of the century, when the spirits between the European countries if had incited, the Americans of the north had used to advantage themselves of the situation to infiltrate themselves in the regions south and central office of America and, gradual, to conquer certain economic predominance in these regions, conquering markets and substituting the Europeans in the economic exploration of Latin America. It came the war, and one more time, advantage for the United States. The European countries in war had come back its production toward the warlike and pharmaceutical industry having diminished the production of good of general consumption. Manufactured products American were exported in mass to the European market. In 1918, Finished the war, the American presence is instant again. Loans and more loans are contracted by the Europeans aiming at to the reconstruction of the destroyed countries. These factors had conditioned U.S.A. a prosperity without precedents.
A period of great abundance generated an identical social euphoria. The American entrepreneurs swam in capitals. He also exported ' ' model of business-oriented men ' ' , the Self-made-mam. (the ready man or the flexible, tolerant professional, wood pra all workmanship). That entrepreneur, that, leaving the humble layers of the population, competently it prospered. All this wealth generated, in U.S.A., a new ideal of life or a new style of American life, ' ' american way of life' '. Total euphoria, general joy, contagiante enthusiasm. But soon and of omens fnebres.