[Jedi Master Pikachu]

Both China and India have about 4 times the population of the United States (the American population is closer to number 4, Indonesia).

And the United States is not overpopulated, at least from a food point of view. China and India each produce enough food to feed their populations, and the United States produces even more than them.

In terms of open land--could be because from an urban area, but--there seems to be enormous tracts of scarcely populated land out there, especially in non-coastal states.

Also, the United States has about twice the land area of the EU while the EU has a population nearing 500 million (494 million), though the EU is not yet a country.

Do you consider the EU overpopulated? (Many would agree with you that China and India are, hence not asking about them).

[Age of Reason]

And the United States is not overpopulated, at least from a food point of view.

Sure, you can get all the insecticide laden corn syrup from chemically fertilzed corn you could ever want.

[Age of Reason]

Also, the United States has about twice the land area of the EU

Sure--we have so much land that every citizen can easily afford a few dozen acres overlooking the Atlantic or Pacific ocean.

Why, there's so much prime real estate in America, they're practically giving it away for free!