Statistics for occurrence #1 of “Mexico” in chapter 21 of Adam Badeau, Grant in peace: from Appomattox to Mount McGregor, a personal memoir:

... great confidence, on a peculiar errand. Schofield was nominally ordered to make an inspection of the troops on the Rio Grande, but he was furnished with a leave of absence with permission to visit Mexico . This had been granted with the concurrence of the President, who had full knowledge of the object in view. At the same time Grant wrote to Sheridan that there must be a large amount of capture...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Mexico (Mexico, Mexico) 8,518 184 0 0 0 user votes
Mexico (Mexico) 1,918 20 0 0 0 user votes
Mexico (New York, United States) 45 0 1 0 0 user votes
Mexico (Indiana, United States) 8 0 0 0 0 user votes
Mexico (Kentucky, United States) 0 0 0 0 0 user votes
Mexico (Maine, United States) 0 0 0 0 0 user votes
Mexico (Maryland, United States) 0 0 0 0 0 user votes
Mexico (Ohio, United States) 0 0 0 0 0 user votes
Mexico (Ohio, United States) 0 0 0 0 0 user votes
Mexico (Pennsylvania, United States) 0 0 0 0 0 user votes
Mexico (Pennsylvania, United States) 0 0 0 0 0 user votes
Mexico (South Carolina, United States) 0 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.