State Sponsors of Acts of International Terrorism--Legislative Parameters: In Brief [Updated May 4, 2021] [open pdf - 1MB]
From the Introduction: "The United States currently designates as state sponsors of acts of international terrorism the governments of Syria, Iran, North Korea, and Cuba. A terrorism designation is but one part in the bilateral relationship between the United States and each of these governments. [...] This brief report provides information on legislation that authorizes the designation of any foreign government as a state sponsor of acts of international terrorism. It addresses the statutes and how they each define acts of international terrorism; establish a list to limit or prohibit aid or trade; provide for systematic removal of a foreign government from a list, including timeline and reporting requirements; authorize the President to waive restrictions on a listed foreign government; and provide (or do not provide) Congress with a means to block a delisting. It closes with a summary of delisting in the past."
CRS Report for Congress, R43835
Congressional Research Service: https://crsreports.congress.gov/