Answer:
He gives a reason for treason.
Step-by-step explanation:
Benedict Arnold's letter a valuable historical document because it gives reason for him to be treason for America being a colonist. He blamed Congress for rushing the people into war, which was long and expensive. The war began without consulting settlers through votes. He wrote a letter in an attempt to vindicate his actions after betraying his country as a British officer. In A Letter To The Inhabitants of America, he endeavoured to justify his actions and urged others to follow his example.