Since 1920 the Jones Act has mandated that the sea transport of cargo between U.S. ports must be performed by vessels that are U.S.-built, U.S.-owned, U.S. flagged, and U.S.-crewed. Justified on national security grounds, the law was meant to ensure a strong maritime sector to bolster U.S. capabilities in times of war or national emergency. These envisioned benefits, however, have proved illusory while the Jones Act has imposed a very real and ongoing economic burden. Despite this, the law survives thanks to well-connected supporters and ignorance of the Jones Act and its costs by the general public.