Oil and Gadgets

The #1 stock by market cap is Exxon.
The #2 stock by market cap is Apple.

America: Oil and Gadgets.

http://www.theonlineinvestor.com/large_caps/

If we want to extend that to the top 5:

#3 Microsoft.
#4 Bershire Hathaway
#5 Walmart

America: Oil, Gadgets, Office/Windows, Insurance, and cheap Chinese crap.