The decline of Ancient Greece can be attributed to various factors. One significant cause was the rise of internal conflicts among Greek city-states. These conflicts weakened the unity and strength of the Greek civilization, making it vulnerable to external threats.

Another factor that contributed to the decline was the ascendancy of Macedonia under the reign of King Philip II and his son, Alexander the Great. The conquests of Alexander the Great brought about a shift in power, with the Greek city-states losing their autonomy and becoming part of the larger Hellenistic Empire.

Despite its decline, the legacy of Ancient Greece is undeniable. Greek culture and intellectual achievements had a profound impact on Western civilization. For example, the democratic system developed in Ancient Greece served as a model for modern democratic governments. Greek philosophy, with thinkers like Socrates, Plato, and Aristotle, laid the foundation for Western philosophical thought. Greek literature, including epic poems such as the Iliad and Odyssey, remain influential works of literature.

Even in the field of science and mathematics, the Greeks made noteworthy contributions. The principles of geometry were advanced by mathematicians like Euclid, while the astronomer and mathematician, Eratosthenes, accurately calculated the circumference of the Earth.

Overall, despite its decline, Ancient Greece's legacy continues to inspire and influence various aspects of our modern world.