USRDA is something like 2000mg a day.
whole, unprocessed foods are low in sodium. ergo on a clean diet, you can feel free to add a little salt to meats, eggs, and cooked veggies.
but when your typical microwave dinner contains 45% of your daily sodium intake in one serving, you can see why its so easy for teh typical american to get 3 times their daily sodium intake between convenience foods, fast foods, and our love of dumping 1g of salt on everything!