Every country definitely wants to promote its own currency.
Small countries only want to get rid of the control of big countries to use Bitcoin as their currency.
As a large country, the United States has not set Bitcoin as a legal tender, indicating that the United States still wants to use the U.S. dollar as a benchmark against the world currency.
The anonymity of Bitcoin can protect everyone's privacy. Bitcoin makes our consumption free, but the country has to control its own economy, which will destroy the anonymity of Bitcoin.
US will probably stick to their own currency and promote US dollar as much as they want so there is no place for bitcoin because it will only destroy their own currency causing the citizens to create doubt and confusion. And as long as bitcoin remains to be transparent which the government has been deprived, then it will never be accepted and legalized.
Not only that, even if US government will deny it but we know deeply that bitcoin has caused threat to dollar because of its high inflation than can be observed when it comes to buying even basic goods and services whereas bitcoin always has its fixed value regardless of price volatility and inflation is not really a big issue.