Statistics for occurrence #1 of “Lower Mississippi” in chapter 31 of Admiral David D. Porter, The Naval History of the Civil War.:

...artery of the North and South, so essential to our nationality, had been accomplished, and the foul blot of human slavery had disappeared forever from our escutcheon. The squadrons of the Upper and Lower Mississippi had shaken hands in New Orleans, and the great highway between Cincinnati and the Queen City of the South was once more open to commerce with the North and with foreign countries. The power of ...
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