The leaders of Belgium, France, Italy, Luxembourg, the Netherlands and West Germany signing the Treaty of Rome on 25 March 1957. The treaty came into force on 1 January 1958. It remains one of the two most important treaties in the modern-day European Union (EU).
![European Union: 1957 – 2017 European Union: 1957 – 2017](https://static.euronews.com/articles/361554/1200x675_361554.jpg)
Video. European Union: 1957 – 2017
The leaders of Belgium, France, Italy, Luxembourg, the Netherlands and West Germany signing the Treaty of Rome on 25 March 1957. The treaty came into force on 1 January 1958. It remains one of the two most important treaties in the modern-day European Union (EU).