World War I was one of the greatest world conflicts in human history. Started by the pursuit of economic and political supremacy in Europe, and consequently throughout the world, and driven by economic ambitions and rivalry of the most influential European countries, it brought everything but world economic and political supremacy to the main actors of the world's greatest military conflict. In a war in which a total of 65 million active-duty soldiers from around theworld took part, and as many as 8.7 million lost their lives, the victors failed to find an adequate political solution to suppress a new military conflict of global proportions. The negative economic consequences of the First World War on both warring sides resulted in the change of the center of world economic power from Europe to the United States. The consequences of political changes after the First World War for Croatia and the Croatian economy were extremely severe given the loss of certain territories, but also anti-Croatian aspirations that existed by other peoples within the Kingdom of Serbs, Croats and Slovenes, and then the Kingdom of Yugoslavia.