Do Nations Go To War Over Water?

"As poor countries diversify their economies, they turn away from agriculture and create wealth from industries that use less water. As a country becomes richer, it may require more water overall to sustain its booming population, but it can afford to import food to make up the shortfall. Areas seemingly desperate for water arrive at sustainable solutions thanks to the import of food, reducing the demand for water and giving an invisible boost to domestic supplies. Political leaders can threaten hostile action if their visible water supplies are threatened (a potentially useful political bluff), while not needing to wage war thanks to the benefits of trade."