Statistics for occurrence #1 of “Upper Mississippi” in chapter 13 of George Ticknor, Life, letters and journals of George Ticknor:

...wer coming upon them, which is destined to have a preponderating authority to keep the peace in all conflicts that may hereafter arise between the North and the South. I mean the great basin of the Upper Mississippi , with its free States, which, after the census of 1850, and the representation which will be organized upon its basis, will have upon all national questions a decisive power, and never endure for a m...
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