Mainly seafood. Back then, fish, crab, clam, and other seafood was much cheaper than now and provided a much healthier diet.
Answer:
I am unsure about John McCain but but I know Obama was the only president born outside of the 48 consecutive states (he was born in Hawaii). I believe John was as well.
Explanation:
The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.