Oliver makes use of the metaphor "In the Ingratitude of this Rebellion" to show the relationship between the British and American Colonies.
This is a figure of speech that is used to make comparisons between two dissimilar things in a direct way.
Hence, we can see from the complete text that Oliver also uses personification to attribute a human attribute to the struggle of the American colonists to get independence from Britian.
Read more about metaphors here:
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