And the machinery for change
And it's here they got the spiritual thirst
It's here the family's broken
And it's here the lonely say
That the heart has got to open
In a fundamental way
Democracy is coming to the U.S.A
It's coming from the women and the men
Oh baby, we'll be making love again
We'll be going down so deep
The river's going to weep
And the mountain's going to shout Amen!
It's coming like the tidal flood
Beneath the lunar sway
Imperial, mysterious
In amorous array
Perhaps a reference to the Biblical flood in the Book of Genesis, in which God decides to flood the earth as a reversal and recreation of the world. 
 This follows the line in which the river weeps, a reversal, and also an image of tears becoming a flooding force: the many come together to produce a powerful change.
Democracy