In the United States, the Securities and Exchange Commission and some state governments have made moves to regulate the trading of cryptocurrencies. Former SEC Chairman Harvey Pitt told CNBC last month that the commission was likely to make major regulatory changes to cryptocurrencies in 2018.
I think that USA is just improving the block chain on other exchangers for faster transactions, there is no way for USA to ban bitcoins in their country because most of the icos today that are being launched are all in U.S. so it will be a huge problem for different companies and they will also comply.