The main concern of Greece in this period was the definition of its borders, both actual and ideal.

An expansion of the Greek state took place and while the Hellenic nation contracted. Some communities remained in their traditional homelands, nurturing the vision of Union.

In this section we will examine the Greek communities outside Greece itself. At the same time, we will observe the movement of Greek populations and troops in each area against the backdrop of political movements, clashes, struggles, persecutions and uprooting.