Forty years ago today, on June 14, 1985 (April 26, 1985 lunar calendar), the five European countries signed the Schengen Agreement. On June 14, 1985, France, Germany, the Netherlands, Belgium and Luxembourg signed an agreement on mutual open borders. Because the place of signature was in the small town of Schengen, Luxembourg, it was called the Schengen Agreement. On March 26, 1995, the Schengen Agreement came into force. This agreement aims to achieve the free movement of people and goods between European countries, especially the member states of the European Union. On December 21, 2007, Estonia, Hungary, Lithuania, Latvia, Malta, Poland, Slovenia, the Czech Republic, and Slovakia joined the Schengen Agreement, expanding the number of Schengen countries to 24. For a variety of reasons, humans do not always settle in one place. From tribal migrations in prehistoric times to the waves of migration in the world today, the pace of human migration has never stopped. However, war and hostility have once interrupted the pace of human migration and integration. In history, the bloody and tragic wars between Germany, France, the United Kingdom, and the West, as well as the division of Eastern and Western Europe after World War II, have forced countries with different ideologies to suspend communication for a long time. More than half a century after Europe emerged from chaotic, disorderly and bloody conflicts, it has developed into an oasis of peace for mutual benefit, coordinated development and common governance. The movement of goods, people, services and capital was the dream of the founders of the European Union. Now the Schengen Agreement has turned this into a reality that benefits all countries. The Schengen Agreement allows citizens of these countries to travel freely to other countries covered by the agreement without customs clearance. This passport-free, customs-free freedom of travel not only brings huge economic benefits to hundreds of millions of Europeans, but also enhances their sense of "European" identity.