Statistics for occurrence #1 of “Missouri” in chapter 25 of Alfred Roman, The military operations of General Beauregard in the war between the states, 1861 to 1865:

...d Louisville were lost in 1861; Nashville, in February, 1862; New Orleans, in April; Galveston, in May; Memphis, in June. Besides these, the Mississippi River was lost, and also the three States of Missouri , Kentucky, and Tennessee, whose young men, generally, were with the Confederacy in feeling, and—if they had had encouragement and timely assistance—would have recruited the Southern armie...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Missouri (Missouri, United States) 15,687 28 1 0 0 user votes
Missouri (United States) 560 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.