Statistics for occurrence #1 of “United States” in chapter 47 of Admiral David D. Porter, The Naval History of the Civil War.:
...the seceding members of the Union, European Governments, with singular unanimity, declared their neutrality between the contending parties, and their intention to treat both alike; viz., that neither United States nor Confederate cruisers should take their prizes into neutral ports.
At first sight, this looked like a concession to the United States, as it excluded Confederate prizes from European ports; but ...
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