What caused the Greeks to unify in defense of their culture and the way of life?

Question

A. the attempt of Athens to force democracy on all the poleis
B. the attempt by Sparta to control all of greece
C. the invasion of Corinth by Thermopylae
D. the threat of the Persian Emprire conquering greece

Answer 1

D. the threat of the Persian Empire conquering Greece

The Greeks unified in defense of their culture and way of life primarily in response to the threat posed by the Persian Empire, especially during the Persian Wars in the early 5th century BCE. The invasion of Greece by Persian forces galvanized the various Greek city-states to unite against a common enemy, leading to significant battles such as those at Marathon and Thermopylae.