While the provided links hint at the answer but don't contain the actual text, I can certainly shed some light on that old piece of paper you've found. So, you've got a "silver dollar bill," eh? Let's hope you didn't quit your day job just yet.
That bill is most likely a Silver Certificate, a type of U.S. currency that was once, as the name implies, redeemable for its face value in silver dollar coins or silver bullion. I have some news for you, and it comes with a tiny, sad trombone sound: you can no longer march into a bank and demand a pile of silver. That particular party ended for good on June 24, 1968.
So, what's it worth now? At the absolute minimum, it's worth its face value. Your one-dollar Silver Certificate can still buy you one dollar's worth of stuff, which is nice. However, its value to a collector is where things get interesting. Most common, circulated Silver Certificates from the 1935 or 1957 series are only worth a slight premium over face value, maybe fetching between $1.50 and $3.
The real money comes down to the classic collector's trio: rarity, condition, and errors. An older, rarer series in crisp, uncirculated condition could be worth hundreds of dollars. If your bill has a star next to the serial number, it's a "star note," a replacement for a misprinted bill, which often adds a little extra value. So, while it's probably not your ticket to buying a private island, it's certainly a neat piece of history that's worth more than the paper it's printed on.
