The Meritorious RBG

All hail the Meritoriuos RBG,
who blazed a trail for all to see,
Opportunity for all - not one,
Work the Senate hopes to be undone,
Corporations cash in on America's moral bankruptcy.

Vote by Mail (if you can)

There once was a country named America,
whose virtues we're all aware of, yeah?
though the USPS united east to west
Trump ended it due to paranoid dementia.

Study point.
In the above paragraph what is the subject of the word 'it?'