Question

what caused the greeks to unity in defense of their culture and way of life? (1 point)
o the attempt of athens to force democracy on all the poleis
o the attempt by sparta to control all of greece
o the invasion of corinth by thermopylae
o the threat of the persian empire conquering greece

Explanation:

The Persian Empire posed a significant external threat to Greek city - states. This common external danger made the usually independent - minded Greek city - states (poleis) come together. Athens and Sparta, despite their differences, joined forces. The threat of Persian conquest was a unifying factor as the Greeks realized that if they were conquered by the Persians, their culture, way of life, and political systems (such as democracy in Athens) would be at risk. The other options are not as significant in terms of unifying all Greeks. The attempt by Athens to force democracy was more of a source of conflict (as seen in the Peloponnesian War). The attempt by Sparta to control Greece was also a source of intra - Greek conflict. The invasion of Corinth by Thebes was a much more local and less unifying (in terms of all Greeks) event.

Answer:

the threat of the Persian Empire conquering Greece