On 1 March 1809, it replaced the Embargo Act, allowing transatlantic trade to resume. The act, which went into effect on 20 May, suspended trade with only France and England until one of them would "revoke or modify her edicts, as that they shall cease to violate the neutral commerce of the United States." The act prohibited their ships from entering American ports and decreed it illegal for citizens of the United States to have "any intercourse with, or to afford any aid or supplies" to any French or English ships. The act also authorized naval officers and customs officials to seize merchandise from ships in violation of the law. It, like the Embargo Act, failed.