Dollar is the international currency and the world business is done through this currency while the US is the super power of the world and they have decides to use dollar for every thing and in the past only dollar were using for business through out the world and now the crypto like bitcoin is ruling in the market and the features of this currency is also better than dollar so we have to invest in the crypto and use crypto for online payments as the popularity of dollar can not be ignored but still the crypto is also good.