Whose protest letter caused Lord Hillsborough to call for the dissolution of the Massachusetts assembly?

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Samuel Adams' protest letter, called the Circular Letter, was circulated among other colonial assemblies and resulted in Lord Hillsborough calling for the dissolution of the Massachusetts assembly in 1768. John Dickinson, Thomas Hutchinson, and Patrick Henry were all prominent figures in colonial America, but they did not specifically write protest letters that led to the dissolution of the Massachusetts assembly.

Whose Protest Letter Caused Lord Hillsborough to Call for the Dissolution