The author’s purpose in this excerpt is to teach readers about a code system used during the American Revolution. Persuade readers that ciphers are the greatest American invention. Argue that Major Tallmadge made a mistake in sharing copies of his codes. Compare the American codes for secret letters to the British codes.

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The given excerpt is from the 'Tools of the Spymaster.' The excerpt wants to teach the readers about the code system used during the American Revolution.

In the given excerpt, it is shown that Major Tallmadge created a secret writing system. The major substituted the words for the digits, such as long islands was 728, and the city was 88.

Major Tallmadge shared the codes with the General of Washington, whereas he gave ciphers to his agents. In the cipher, he replaced the letter in a message with another letter or number.

Thus, Major Tallmadge was the leader of Culper Rings, which helped him to survive and protect the country during the American Revolution.

To know more about spymaster, refer to the following link:

https://brainly.com/question/3957906

Answer: A- teach readers about a code system used during the American Revolution.

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