How could the unpredictable flooding of the rivers in Mesopotamia effect their government and religion?

The correct answer to this open question is the following.

Unpredictable flooding of the rivers in Mesopotamia affected their government and religion in that Sumerians demanded the priests to maintain contact with Gods because they believed that the Gods were unpredictable and had different moods. They were the ones who sent catastrophes to the Earth such as the flooding of the rivers, earthquakes, or heavy rain. So rulers and people demanded priests to keep the gods happy through sacrifices. Sumerians believed that they were at the mercy of these strange and whimsical gods.

Let's remember that Sumera-Mesopotamia was settled in the middle of the Tigris and Euphrates Rivers. so the flooding of the rivers was a major problem for them.

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

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false articles of confederation, ultimately building a new government and new constitution with an executive, legislative, and judicial branch and a system of checks and balances.