The US Department of Agriculture listed Wakanda as a free-trade partner – despite it being a fictional country.
A USDA spokesperson said the Kingdom of Wakanda was added to the list by accident during a staff test.
The department’s online tariff tracker hosted a detailed list of goods the two nations apparently traded, including ducks, donkeys and dairy cows.
In the Marvel universe, Wakanda is the fictional East African home country of superhero Black Panther.
The fictional country was removed soon from the list after US media first queried it, prompting jokes that the countries had started a trade war.