The US dollar is a "Fiat" currency (as is bitcoin)
It means that it isn't "backed" by anything materially valuable like gold & silver. And it's only value is perceived by the user based on it's scarcity.
The US dollar is the MANDATED currency in the US. You will go to jail if you use something else.
http://en.wikipedia.org/wiki/Liberty_DollarThis insures it's continued use and allows for the government to inflate the money supply (Print & spend money) which is the whole purpose behind having a national currency.
Your banks also play a major role in your money though their "fractional reserve" lending policies. with what a bank can take the $100 dollars you deposited loan out 90% to someone else, gain interest, and all this time claim a balance sheet of $190 while it only has $10
This is why there is the FDIC who's job it is to send as much as possible money to that bank in case it looses it's illusion of solvency in the eyes of it's depositors.
This brings to front the process of inflation (which is where bitcoin has an advantage) The value of your money decreases with every dollar created by your gov, and loaned out by your banks. Slowly, yes. But it increases exponentially and there is no stop or pause button for anyone to press.
This is why I prep.If I may I would recommend to you to watch these following videos which explains what money, currency, our current situation is perfectly. (yes he's trying to sell you gold but can you blame him?)
1] Origins of Money & Currency
2] Evolution of empire & Currency
3] His personal story and predictions
4] Why the dollar is a scam
5] History of Fiat Currency
So back to bitcoin, buy some.
Why? because uncle Sam hates it. It directly undermines their influence, because it inflates at a pace dictated by the demand for it and the inflation advantage is dispersed so it ignores it (no gov/banks with magically deep pockets) It's something they can't regulate, it holds a hail marry chance of replacing the dollar
when it goes belly up. Saving me from having to trade bullets. But it's a chance so I'll take it.
Any more questions feel free to ask, felt the post was getting a bit long.
Also I'd like to point out that I announced the whole bitcoin thing when it first came out
. Pretty sure it was the old L&L forum.