A U.S. coin is a type of currency used in the United States of America.
A two cent US coin is larger in size than a ten cent US coin.
Sacagawea is on the US $1 coin.
They never have. If your coin has a hole and is a US coin then someone drilled it in. It was not done at a US mint.
The first US dollar coin was made in 1794.
You are probably thinking of an "error coin". This coin is any coin which does not meet the standards of the US Mint or has a flaw in its design or manufacture.
Harriet Tubman has never been on a US Mint Coin.
...Of what US coin? There have been several US coins intended for circulation ranging from half a cent to $20.
Take it to a coin shop. They will tell you if it is real or not.
Please be more specific which coin?
The US 50 cent coin has JF Kennedy on it.
The penny coin which was worth a cent
The US 10 cent coin has president Roosevelt.