The issues addressed in this thesis present one of the central themes in the Italian historiographical debate, especially on the link between national / international level and how it has interacted with the history of the second half of the twentieth century. In this context, however, it became necessary to consider the first the events related to the eastern border of Italian before 1945, as these are closely linked to subsequent developments in a cause / effect is very important in order to understand the dynamics of the period covered by the research.
The purpose of this work is to investigate and study how this issue has been politically present in the debate of those parties which were protagonists in the first Republican era, such as the Italian Communist Party, the Christian Democrats and the Italian Social Movement, examining how have been formed their positions about the Italian eastern border question
