The Moloch State Pack is a new set of cards you can use during your games of 51st State: Complete Master Set.
Set up the base game as usual with the following changes and additions: shuffle all 27 cards of the Moloch set together with the 88 cards of the Base Set to prepare your deck for the game, then shuffle the Machine cards to create the Machine deck.
You also choose a difficulty that you face for the game ahead.