Britain, France, Portugal, Spain, the Netherlands and Belgium built overseas empires that generated immense wealth, secured raw materials and expanded their global influence. Yet history often produces unintended consequences. Although Britain and France emerged victorious, they were economically exhausted and struggled to maintain costly overseas possessions. Britain recruited workers from Commonwealth countries, France encouraged immigration from North Africa, and Germany invited guest workers from Turkey and Southern Europe. Yet history offers an enduring lesson: the pursuit of short-term advantage often produces unforeseen long-term consequences.