One important difference between the nile river valley and mesopotamia was

the Nile flooded at the same time every year as opposed to the unpredictable flooding of the Tigris and Euphrates Rivers. The predictability of the flooding allowed agriculture to become a mainstay in Egyptian cultures that made their homes along the banks of the Nile river. The predictable floods brought fertile soils which signaled the start of the growing season each year.  

Explanation:

legal rights and freedom of speech.i hope that it is correct.

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ghana achieved independence peacefully, while algeria gained independence through an armed struggle.