Scrambled or fried (or poached, or hard boiled or soft boiled) eggs, toast (wheat, white, sourdough), buttermilk bisquits (sometimes with sausage gravy on top) sausage, ham, bacon, french toast, hash browns, cereal, fried potatoes, pancakes, waffles, coffee, milk, orange juice.
Those are all some of the components of some typical American breakfasts. From what I see, people generally put together different combos of three or four of the above foods. Or more if they feel like it.