From the Document: "After the September 11, 2001 attacks, economic and financial sanctions ('sanctions') became a tool of first resort to address a range of threats to the national security, foreign policy, and economy of the United States. This tool rests on the formidable strength of, and trust in, the U.S. financial system and currency. At their core, sanctions allow U.S. policymakers to impose a material cost on adversaries to deter or disrupt behavior that undermines U.S. national security and signal a clear policy stance. Treasury's work on sanctions is conducted in close partnership with other parts of the Executive Branch, in particular the Department of State and the National Security Council, which lead the formulation of the foreign policy and strategic goals that sanctions serve, as well as the Department of Justice. The Department of State also implements certain sanctions authorities in consultation with the Treasury."
United States Department of Treasury: https://home.treasury.gov/