Final answer:
The Classical Persia Empire came to an end in 331 BCE when it was conquered by Alexander the Great.
Step-by-step explanation:
The Classical Persia Empire came to an end in 331 BCE. The empire was conquered by Alexander the Great, who led the invasion of Persia and defeated the Persian King Darius III in the Battle of Gaugamela. After the defeat, Alexander gained control over the Persian Empire, marking the end of the Classical Persia Empire.