Statistics for occurrence #1 of “United States” in chapter 5 of Hon. J. L. M. Curry , LL.D., William Robertson Garrett , A. M. , Ph.D., Confederate Military History, a library of Confederate States Military History: Volume 1.1, Legal Justification of the South in secession, The South as a factor in the territorial expansion of the United States:

.... Territorial expansion a distinctive feature in the history of the United States the South a leading factor in this policy. In one important respect the history of the United States differs from the history—transcends the history—of any other great power of the world. Its boundaries have never receded. It is true, indeed, that some of the great powers have gained...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
United States (United States) 100,886 1,386 0 0 0 user votes
United States (New Mexico, United States) 6 0 0 0 0 user votes

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