Why is 1 dollar called a buck?

The term 'buck' for 1 dollar originates from the use of buckskin, or deer skin, as a trading medium in early America. Before the official adoption of the Dollar in 1792, buckskin served as a common currency, and 'buck' became a slang term for money. Over time, this slang evolved to represent the Dollar, and it remains in use today as a colloquial expression for 1 dollar.