Why as Engla mad at the arrest of James mason and john slidell?

Answer 1

England was upset about the arrest of James Mason and John Slidell because they were Confederate diplomats traveling on a British ship, the RMS Trent, to negotiate support for the Confederacy during the American Civil War. The Union's seizure of the diplomats was seen as a violation of international law and an affront to British sovereignty. This incident nearly led to a diplomatic crisis between the United States and Great Britain, as England demanded their release and threatened war if they were not returned. Ultimately, the U.S. government released Mason and Slidell to defuse the tension.