Give an example of personification in the poem "To His Exellency, General Washington," by Phillis Wheatley.

This poem by Phillis Wheatley, "To His Excellency, General
Washington," was written and sent in a letter to General Washington by the author. 
Wheatley was obviously inspired by Washington, and his return letter to her is equally
complimentary.  Wheatley uses many complex images and allusions, and this poem is no
exception.  Your question is about personification, and I found several examples in the
first few lines of this poem. 

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While freedom’s cause her anxious breast
alarms,
She flashes dreadful in refulgent arms.
See mother earth her
offspring’s fate bemoan,
And nations gaze at scenes before
unknown!

Here, freedom and
mother earth have been personified (inanimate objects given human qualities).  Freedom
here feels alarm, and she "flashes dreadful"--both human actions which a literal freedom
can not do.  Mother earth has children ("offspring") and she "bemoans" (cries out in woe
over) their fate. 

If you keep reading, there are plenty
more examples of personification in this poem.  The e-notes link below has some other
helpful information regarding Phillis Wheatley and this particular
poem.