Highlighting the British Navy's appropriation of American ships and mariners, Poseidon's Curse places the American Revolution in its wider Atlantic World context, demonstrating how events on and around the Atlantic Ocean helped cause the Revolution.

Poseidon's Curse interprets the American Revolution from the vantage point of the Atlantic Ocean. Christopher P. Magra traces how British naval impressment played a leading role in the rise of Great Britain's seaborne empire, yet ultimately contributed significantly to its decline. Long reliant on appropriating free laborers to man the warships that defended British colonies and maritime commerce, the British severely jeopardized mariners' earning potential and occupational mobility, which led to deep resentment toward the British Empire. Magra explains how anger about impressment translated into revolutionary ideology, with impressment eventually occupying a major role in the Declaration of Independence as one of the foremost grievances Americans had with the British government.