What effect did the invention of irrigation systems have on both ancient Egypt and Mesopotamia? Please help me asap I need it for a tes

The invention of irrigation systems allowed humans to begin agriculture in Egypt and Mesopotamia. Humans were able to begin civilizations and start staying in one place. They were able to establish cities instead of being hunters and gathers.

Explanation:

hitler was elected as a strong leader by germans who felt angry following the treaty of versailles.

answer; /// i do believe that its napolean's conquest of spain;