Answer:
<em>R</em><em>I</em><em>O</em><em> </em><em>G</em><em>R</em><em>A</em><em>N</em><em>D</em><em>E</em><em>.</em><em>.</em>
Explanation:
Texas claimed the Rio Grande as its southern border. Mexico said the Nueces River, to the north, should be the border. The dispute simmered until Dec. 29, 1845, when the U.S. annexed the Lone Star State, and sent troops to the Rio Grande a month later. Mexico attacked in April 1846, and when the Mexican-American War ended in February 1848, the border we see today began to take shape.
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