A) What caused the Greeks to unify in defense of their culture and way of life? (1 point)

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
the threat of the Persian Empire conquering Greece

The threat of the Persian Empire conquering Greece caused the Greeks to unify in defense of their culture and way of life.

The correct answer is:

- The threat of the Persian Empire conquering Greece

To determine the answer, we need to consider the options provided and analyze the historical context.

A) The attempt of Athens to force democracy on all the poleis: This option suggests that the unification occurred in response to Athens' attempt to impose democracy on all the city-states. While Athens did implement a democratic system and exerted significant influence in ancient Greece, it did not lead to a unification of the Greeks.

B) The attempt by Sparta to control all of Greece: This option suggests that Sparta's attempt to dominate the entire region led to Greek unification. In ancient Greece, Sparta was known for its military strength, and there were conflicts between Sparta and other city-states. However, this alone did not result in a unified defense of Greek culture and way of life.

C) The invasion of Corinth by Thermopylae: This option provides a specific event, the invasion of Corinth, which could have triggered a unified defense. However, it is important to note that Thermopylae is a location, not an invading force or city-state.

D) The threat of the Persian Empire conquering Greece: This option presents a significant historical event that led to the unification of the Greeks. The Persian Empire, under King Xerxes, launched two major invasions of Greece in 490 BCE and 480 BCE. These invasions threatened the independence and way of life of Greek city-states, leading to a unified defense against the Persian Empire.

Therefore, the correct answer is D) the threat of the Persian Empire conquering Greece. The Greeks put aside their internal conflicts and united in defense of their culture and way of life against the Persian invasions.