Historical clue formulations

• Trading off? — 2023-10-21
• Trade restriction — 2023-05-30
• Complete shutout? — 2014-04-20
• Trade barrier — 2013-02-05
• Prohibition — 2011-07-23
• Blockade — 2010-12-12
• Economic warfare tactic — 2002-04-07
• War move — 2001-05-13
• Prohibition — 1996-03-22