Statistics for occurrence #1 of “Fort Niagara” in chapter 5 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 3, 15th edition.:

...h;to dictate law to the Iroquois, and to exclude the English from the fur-trade. And, in 1726, four years after Burnet had built the English trading-house at Oswego, the flag of France floated from Fort Niagara . The fortress at Niagara gave a control over the commerce of the remote interior: if furs descended by the Ottawa, they went directly to Montreal; and if by way of the lakes, they passed over the...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Fort Niagara (New York, United States) 348 4 2 0 0 user votes

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