The United States dollar (sign: $; code: USD; also abbreviated US $ and referred to as the dollar, U.S. dollar, or American dollar) is the official currency of the United States and its insular territories per the United States Constitution. For most practical purposes, it is divided into 100 smaller cent () units, but officially it can be divided into 1000 mills (). The circulating paper money consists of Federal Reserve Notes that are denominated in United States dollars (12 U.S.C. 418).

Answer this question based on the passage: the united states today uses which kind of currency? OK. Let's think. My stream of consciousness:
This is the relevant information: The United States dollar (sign: $; code: USD; also abbreviated US $ and referred to as the dollar, U.S. dollar, or American dollar) is the official currency of the United States and its insular territories per the United States Constitution. The answer is The United States dollar.