By conquest.
Iran
He built it by taking over the Babylonian and Lydian Empires, and consolidating these and Persian-Mede territory.
It established a territory from Asia Minor to the Indus River. Within this territory it attemped to maintain peace, prosperity, security and used local government to rule, under Persian provincial governors (satraps).
The main weakness was their size. With such a large territory it was hard to control and protect everyone
By conquest.
The Greek city-states occupied by, or threatened by, expansion of the Persian Empire in the eastern Mediterranean littoral.
Assyrian Empire.
Iran
Arabia and central Africa.
Persia (modern Iran).
The territory of the ancient Assyrian Empire primarily overlaps with parts of several modern nations, including Iraq, Syria, Turkey, and Iran. The heartland of the empire was concentrated in northern Iraq, particularly around the cities of Nineveh and Ashur. Additionally, regions in southeastern Turkey and northwestern Iran also encompassed areas that were once part of the Assyrian Empire.
He built it by taking over the Babylonian and Lydian Empires, and consolidating these and Persian-Mede territory.
It established a territory from Asia Minor to the Indus River. Within this territory it attemped to maintain peace, prosperity, security and used local government to rule, under Persian provincial governors (satraps).
The Persian Empire rose in Persia and Media. Israel was a minor and insignificant territory with the Palestine, ruled by a foreign aristocracy imported by Assyria two hundred years earlier.
I believe the correct answer is The Safavid Empire.
The main weakness was their size. With such a large territory it was hard to control and protect everyone