The Benelux Union was formed with Belgium, the Netherlands, and Luxembourg joining together to create a customs union and enhance mutual economic cooperation. The idea for economic collaboration among these three neighboring countries emerged during World War II when they were subjected to foreign occupation. The war created a backdrop of necessity for these nations to find stability and security in their economic relations. The Benelux agreement would not only establish a shared market but would also facilitate political cooperation aimed at peace and prosperity after the turmoil of the war. This foundational treaty laid the groundwork for deeper integration in Europe, as it set a precedent for future alliances and cooperative efforts, such as the precursor to the European Union that followed in the decades afterward. The formal establishment of Benelux marked a new era of collaboration and reconstruction for these nations as they sought to emerge from the war's consequences.