In her poem "To His Excellency General Washington," Phillis Wheatley closely associates the cause of American independence with divine favor and aid.
Right in the very first line, Wheatley implores the "Celestial choir," the choir of angels, to look upon Columbia's "scenes of glorious toil." "Columbia" is another name for the United States, and the poet declares its cause to be freedom. The country is involved in a major struggle, yet "the bright beams of heaven's revolving light" fall upon it, brightening the "sorrows and the veil of night" that come from war. God and His angels are on the side of America.
Columbia herself is identified as a goddess. Wheatley doesn't mean this literally, but she uses the image (drawn from ancient mythology) as another way of expressing the divine favor bestowed upon the United States and its cause. Columbia is associated with divinity, with God and beauty and truth and goodness and righteousness. Further, Columbia's army is compared to the armies of Heaven pouring out of the golden gates to serve the cause of freedom. They appear almost like an army of angels, filled with "grace and glory," valor and virtue.
At the end of the poem, Wheatley addresses George Washington directly, telling him that virtue is on his side and imploring him to let Columbia guide his every act. In other words, he is to receive divine assistance, and if he accepts and follows it, as the poet implies that he will, he will receive "a crown, a mansion, and a throne that shine" as well as victory in his just cause.