Question

what caused the greeks to unify in defense of their culture and way of life? (1 point)

the threat of the persian empire conquering greece

the attempt of athens to force democracy on all the poleis

the attempt by sparta to control all of greece

the invasion of corinth by thermopylae

Explanation:

The Persian Empire posed a significant external threat. Greek city - states (poleis) had their own cultures and ways of life. Facing conquest by a foreign power (the Persian Empire) was a common danger that could unite them. Athens' push for democracy was more of an internal (among Greek city - states) political dynamic. Sparta's attempt to control Greece was also an internal power struggle. The invasion of Corinth by Thermopylae is not a major event that would cause such a broad - based unification. Thermopylae was a battle site during the Greco - Persian Wars.

Answer:

The threat of the Persian Empire conquering Greece.