Statistics for occurrence #1 of “Matamoras” in page 15 of Matthew Arnold, Civilization in the United States: First and Last Impressions of America.:
...rosecute the contest with vigour.
Once initiated, there were few public men who would have the courage to oppose it.
Incensed at the Americans fortifying themselves on the Rio Grande, opposite Matamoras , the Mexicans at last fired the necessary shot, and the war was commenced.
This was in March 1846.
In September 1847 the American
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