I don't know how much of it Americans drink, but it is sure as hell a lot more than we consumed 30 or 40 years ago.
I know as a kid, we didn't get it every day, and when we did get it, it was a 6 oz. bottle and considered a treat, not part of a meal. The didn't even sell it in the school cafeteria. Now you see kids sucking this crap down by the gallons, and then bouncing off the walls.
I'm not a neutrition zealot by any means, but a rule of thumb it that too much of anything is bad, and we (especially kids) drink way too much soda.
In the age of the big gulp and the supersize you would be very wrong.