Question: The Blockade of Africa began in 1808, the same year as which US law about slaves?
{'answer': 'Act Prohibiting Importation of Slaves', 'supporting_facts': [['Blockade of Africa', 0], ['Blockade of Africa', 4], ['Act Prohibiting Importation of Slaves', 0], ['Act Prohibiting Importation of Slaves', 2]]}