I would say America has many different cultures mixed in. So many races live in America .
The Indo-European tribe called the Aryans invaded and conquered the Indus Valley Civilization, but many scholars believe that the collapse of the Indus Valley Civilization was caused by climate change.
When water intake is low, spinal cells in the brain signal the pituitary to release ADH or antidiuretic hormone. The main function of ADH is increasing the urine concentration and thereby it helps in preserving the amount of body water lost in case of low water consumption by an individual. I hope the answer comes to your help.
