Flooding rivers helped contribute to the beginning of farming communities because of sediment deposits that would be spread beyond the banks of the river to the land near rivers. This sediment helped to create highly fertile land that could then be used for farming. The mineral rich sediment helped to develop early farming and allowed for the natural cycle of rivers to boost agricultural production.
Answer:
Southern states enacted black codes after the Civil War to prevent African Americans from achieving political and economic autonomy.
B.) To generate public support for the war effort
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It's somewhat a matter of opinion, since many people have their favorites and it always looks good if you answer "Nelson Mandela". The truth is that after WW 2, the world got divided into a "Western" bloc under US leadership and a Communist bloc under the Soviet Union. The various US Presidents and Communist Party Secretaries all shaped the world in the Cold War era. A good candidate however is Soviet party leader Mikhail Gorbatchev, who practically single-handedly dismantled the old Soviet Union and thereby ended Communist rule over many eastern European countries. Americans tend to thank Ronald Reagan for that, but that is vastly overrating his actual influence on affairs. We Westerners like Gorbatchev for that, but in Russia he is generally seen as a weak leader and the man who 'sold out' Russia's global power and prestige and who was responsible for much of the following unrest until "thank God" Vladimir Putin took firm control and put Russia back on the map again.
