Landscape of the United States using the terms highland and lowland.

I’m not quite certain what your asking, but what I got from the question was: You could say that the North western part of the United States is the highland because we have the Rockies (or in other words the Rockies mountains, which are huge in elevation) in that area and our elevation is higher compared to the south eastern part of the United States who border the ocean (can’t remember which ocean). I hope this is what you were looking for!

Thomas edison created the light bulb.