Why were the civilizations in the Fertile Crescent frequently invaded?

Because it is well suited for farming and people wanted that land

Explanation:

Both the Tigris and Euphrates river flow through the surrounding lands in the Fertile Crescent. ... It was surrounded by dry land and mountains also, but they were not as barren and were more easily invaded. Because of this region's relatively abundant access to water, the earliest civilizations were established in the Fertile Crescent, including the Sumerians. ... Irrigation and agriculture developed here because of the fertile soil found near these rivers. Access to water helped with farming and trade routes.

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