The European project started with coal and steel but then broadened its focus to the economic sector, agriculture, social issues, the environment and many other policy fields. One of the original goals of the European Communities was to reduce the gaps between the various European regions, by strengthening the unity of their economies end ensuring their continuous development.
European institutions invested in development projects that left concrete footprints in the landscape of the Member States, and implemented a growing range of common policies that affect the everyday lives of European citizens. This process was not straightforward nor predetermined, but in the end it has fostered an ever-expanding web of relations between European countries. The question remains, how much it has contributed to create a de facto solidarity.

The European Investment Bank (EIB) was established in 1958 to contribute to the financing of viable capital projects which further EU core values and policy goals.

On 25 March 1957 the representatives of Belgium, France, Italy, Luxembourg, the Netherlands and West Germany signed the Treaties of Rome, thereby founding the European Economic Community (EEC) and the EURATOM.
In the Preamble to the Treaty establishing the EEC, all the signatories committed to improve the living and working conditions of their peoples, and to reduce the differences existing between the various regions, in order to ensure the economic and social progress of their countries.​