Answer:
Reconstruction Period
Explanation:
Reconstruction Period was the period of time when Congress tried to punish the South for the Civil War.
They settled in river valleys because they wanted their crops and soil to be rich and eaiser to water their plants.
The pros of the Nile River are: it provided water for crops, gave a water source, and provided a food source. The cons were: over flooding, pollution, and caused destruction to homes and farm lands.
my best answer would be The legal authority to take action.. choice D