According to the preamble, where does the power for government come from?

The power of the government comes from the "consent of the governed" ... which is us .

That means the government is only allowed to govern us as long as we lettum.  But the minute we say "no", the government suddenly has no power.  They have to turn out the lights, go home, and let somebody else ... who we consent to ... move in and start governing.  

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement