Answer: the League of Corinth was a coalition of Greek city-states created in 337 BCE by King Philip II of Macedon. The main purpose of the League was to unite the Greek city-states under Macedonian leadership and to prepare for an invasion of the Persian Empire. The League was named after the city of Corinth, which was the meeting place for the representatives of the member states.
Philip II saw the League as a way to bring peace and stability to Greece, which had been divided by decades of internal conflict. By uniting the city-states, he hoped to create a stronger military force that could resist external threats and prevent civil wars. The League was also designed to counter the power of Athens, which had been the dominant city-state in Greece for much of the previous century.
The League was formed with the support of most of the major city-states of Greece, including Athens, Thebes, and Sparta. However, the League was dominated by Macedon, which provided the majority of the military and financial resources. Philip II was elected as the leader of the League, and after his assassination in 336 BCE, his son Alexander the Great took over as the leader.
The League of Corinth played a key role in Alexander the Great's conquests of the Persian Empire. It provided him with a unified army that could march across the vast expanses of the empire and defeat the Persian forces in several decisive battles. After Alexander's death in 323 BCE, the League dissolved, and Greece became part of the Hellenistic world.