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IMO, what Spoetnik has said, is when you use an exchange, they record your Name & Address & SS# & in some cases your Picture ID.
Every Exchange has a record of exactly how much Monero you purchased and how much you sent out and how much you received, and at what time intervals, all of this information can be cross referenced.
(Does not matter if monero is never cracked, they can still find you.)Tor does not protect your IP address as asshats get arrested all of the Time and the FBI refused to revel how they found them.All the US Gov has to do , is list monero as a money launder tool or terrorist tool, and every exchange and every other Business where you purchased anything will give up your real name & address , including IP address , so fast it will make your head swim, then have someone at your home requesting to view your private transactions and keys which the mere refusal would give you jail time.

You guys really fail to understand what you are up against ,
sadly only changes in international & local laws or straight up rebellion will end this nonsense.Anon is just a joke, in the current society, because the deck has been stacked against anon , from before most here were even born.

In short they would have to ban it.
This would mean changing the law to make it illegal not the other way around as the above incorrectly implies. Even then there is the issue of ex post facto law. I would start by reading the actual guidance(s) on crypto currency form FinCEN before making assumptions about the legality of certain crypto currencies in the United States. Here is a good place to start.
https://fincen.gov/statutes_regs/guidance/html/FIN-2013-G001.htmlThe first question I would ask is does your favorite crypto currency meet the definition of De-Centralized Virtual Currency under the FinCEN guidance above?
Edit 1: Russia has considered making crypto currency illegal. We will see if this actually happens and what impact that will have on US law.
Edit 2: As a baby boomer I am old enough to remember both the hight of the cold war, and when cash was king for most payments.
Edit 3: If one is concerned about surveillance by the NSA a good place to start is to not outsource control over one's computers, or devices to companies that are part of the PRISM program
https://en.wikipedia.org/wiki/PRISM_(surveillance_program),
https://en.wikipedia.org/wiki/File:Prism_slide_5.jpg This includes both Microsoft and Apple. By the way I consider commercial surveillance (spying by corporations on consumers for marketing or DRM purposes) and not agencies such as the NSA to be the real threat to freedom and civil liberties here.