Answer:
The answer is interactionist perspective.
Explanation:
As the name suggests, this approach studies the interaction of people within a society, and focuses on how these interactions shape their environment.
Interactionists may use different methods, such as interviews and observational participation, for collecting data. It's also possible to use secondary sources.
Rome inevitably invaded Greece since Rome was far too powerful and skilled in military combat. To be free from Roman leadership, Greece supported the enemies of Rome in wars as they believed Rome will be weaker with combined enemies. And it worked, soon they were free from the Roman empire.