The Indus and Ganges Rivers form a fertile plain. This fertile plain gave rise to the important civilization known as the Indus Valley civilization and cities, such as Harappo and Mohenjo Daro. The arrival of the nomadic Aryan tribes to the Valley of the Indus River is related, according to some historians, for the decline of the Indus River civilization.
The findings of the Nye Committee.
It could be increased greenhouse gas effect.
Countries would want to keep or make nuclear or bio weapons to become world powers or have the upper hand against other nations without that kind of power
<span>Spain, the 1700's, presumably. This was a pretty tough answer to find, so I hope the one reference helps you out.</span>
