Cryptocurrency is known as the fastest transaction medium for people around the world.
Where did you read that, what could be faster than just bringing out fiat from your pocket and paying for what you have just bought.
Suppose a country began to use Bitcoin instead of their currency. Then, what will happen?
We have discussed about this so many times, BTC was not created to replace fiat money, it is fine as an alternative, just like it was in El Salvador. BTC is decentralized, it is also a virtual currency, centralized governments cannot replace their fiat currency with something they cannot print or control.