How did civilization evolve from the river valley time period to the end of the classical era?

Life has always been tied to water.

Explanation:

Thus, the world's oldest civilizations have just emerged in territories where there was enough water. For example, we can take the Euphrates and Tigris as the rivers on which culture was born. Egyptian civilization was also born thanks to the Nile River.

Water primarily provided man with a source of drinking water, thanks to the water, a man was able to satisfy his hygienic injuries. The water also provided him with the opportunity to irrigate his crops and to water his cattle.Thus, thanks to nature, man developed his original habitats. Over time, man evolved, and "domesticated" water and life, and a more complex irrigation system was designed.

what the first or next guys says

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.