Article I of the United States Constitution lists "grant[ing] Letters of Marque and Reprisal" as an explicit power of the Congress. Are these still being issued? If not, when was the last one of these issued?
The last time the United States Congress issued a letter of Marque and Reprisal was during the War of 1812. The last time they considered it was during Andrew Jackson's administration. The Declaration of Paris is an international law signed onto by over fifty nations. Created in 1856, the United States abides by the provisions thereto. It prohibits the act of privateering. Thus, although Congress have the Constitutional authority to grant letters of Marque, they essentially cannot do so without violating international law.