He did not destroy it - he took it over. This was an ambition of his father Phillip II of Macedonia, however he was murdered and his son Alexander successfully took on the project.
People don't want to destroy an empire - it is much more valuable and rewarding as a going concern. The government within the Empire simply changed. Alexander retained some of the existing Persian provincial governors, replaced others with Macedonian generals. But he was about establishing good government and prosperity, not destroying.
Alexander the Great's conquest of the Persian Empire created an empire reaching from Egypt to India.
Alexander the Great.
Alexander the Great
Alexander the Great.
Alexander the Great invaded and conquered the Persian Empire in the year 334BC
Alexander the Great defeated the Persian empire
Alexander conquered the Persian Empire.
Alexander the Great conquered the Persian Empire and converted it into an empire of his own, not to destroy the Persians but to convert them to Greek culture.
The Macedonian Greek Empire of Alexander the Great conquered the Persian Empire and incorporated all of its lands.
Alexander the Great's conquest of the Persian Empire created an empire reaching from Egypt to India.
Persian Empire
The Persian Empire.
Persian Empire
Alexander the Great extended his empire by conquering the Persian Empire and turning it into an empire of his own.
Alexander the great
Alexander the Great.
Alexander the Great.