If America runs out of water how horrendous are the implications for the rest of the world?

Wars have started because of water and food shortages, but those have all been in foreign countries. That wont happen in your lifetime here in the states bro. Yes, water is in a cycle of rain, stream runoff, oceans and evaporation. Water can neither be created nor destroyed. It can only change forms. Even if rain stopped ( also which won't happen ), we have the oceans to tap.

The world is 70% water...

Clean fresh water supplies may get scarce as what happened to Florida, South Carolina, and Georgia either last summer or this summer. Storms and rain hit, water was piped in from other sources and the drought problem was ( at least temporarily ) resolved. Water will never run out!

I think you should mean what if America's Water becomes Polluted by Toxins and Effluent from Industries and also Animal and Human Waste. This is a big Problem in many Parts of the World and not just shortage of Water but actually keeping the Stuff Pure. In some Countries after Flooding Water becomes contaminated mostly by Sewage because of Overspill from Plants. This has Happened in America , Ireland ,Britain, but mostly in Places like India and Bangladesh and Africa.

At the moment there is Pressure on Canadians to hand over their Water to the US, and some controversy about Canadian Politicians doing Secret Deals with the Americans to Sell them Water.

Do you mean the USA? If the Republicans win in November, then they would probably find some excuse to invade any country which still had water, take the area by force and then try to sell the water to any other drought stricken area for a horrendous amount of dollars. Of course, the dollar would then rise in value..

America will not run out of water, but if we do have water shortages, it will result in America producing less food and other products for the rest of the world, which would result in serious worldwide problems.

America will not run out of water. Towns sometimes run out because their reservoir runs dry, but as soon as it rains they are fine. America is surrounded by water that can be purified.

Hard to run out of water. It goes in a cycle. Countless times over, and the Southern polar ice-cap is melting, and that leaves it likely to be evaporated in this time of global warming, so there is more water available!

If America runs out of water I'm sure we can "convince" Canada and Mexico to "help out".

Party ! big one . world party - no Yanks . seriously it's not likely is it flooding of the Mississippi and valleys is more likely , the rest of the world would adjust it's happening credit drunch ? people are getting worried .

Last time i looked we have plenty of water.

Urm their will be no repurcussions...

And it will never happen