To His Excellency General Washington is the poem by Phillis Wheatley that was first mentioned in print.
The first poem that Wheatley was known to have published was titled "On Messrs. Hussey and Coffin."
This is allegedly a poem that was known to have appeared in the Newport Mercury newspaper in Rhode Island in the year 1767.
Note that To His Excellency General Washington is the poem that Phillis Wheatley is credited with writing.
Thus, General Washington is the poem by Phillis Wheatley that was first mentioned in print.
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