The military history of Iraq, due to a rich archaeological record, is one of the longest in written human history. The region of Iraq, which used to be Mesopotamia, has been referred to as the "cradle of civilization", and wars of conquest have been recorded in this region as far back as the third millennium BC. Because of its geopolitical dominance and ideology based in world domination, the Neo-Assyrian Empire is by many researchers regarded to have been the first world empire in history. The area possesses strategic value, initially for the rich, fertile agricultural region in the Mesopotamian plain, and more recently for large petroleum deposits and access to the oil-rich Persian Gulf. The present territory of Iraq lacks significant strategic barriers, making it difficult to defend aga