Invent bitcoin (USA). Use bitcoin to snare online criminals (done). Blow bitcoin up into mass hysteria and uptake (done). Watch as everyone uses their stimulus cheques to invest into either a) Wall Street or b) bitcoin (done). Blackrock enters the chat (done). Assume full control of bitcoin (USA, done). Laugh as everyone thinks they're winning, cashing or hodling their bitcoin (USD) for.... USD. 

Wait for every possible person to put their money into it, then.... Pull the rug (imminent).

Did I miss anything?

P.S something owned more than 50% by one government cannot be "decentralized". “ - anonymous 

Thoughts ^