Ka, mana, mojo, happy elf juice, whatever you want to call it -- it's the life force of the country and it comes in seven flavors: air, fire, water, earth, gold (solar-ka -- The Sun), silver (lunar-ka -- The Moon), and finally orichalka, the anti-ka. Its currents make the ley lines that are traced by America's HighwaySystem (and the roads, in turn, channel and harvest the ka). It pools in places, too, most notably in seven nodes -- known in American legend as the SevenCities of Cibola.

See AmericaIsAnEngine.