The primary cause of the Mexican-American War was the admittance of Texas to the United States in 1845

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Quizplus · Accepted Answer

The primary cause of the Mexican-American War was indeed the admittance of Texas into the United States in 1845, which led to disputes over the border between Texas and Mexico. Mexico never recognized the independence of Texas and claimed the Nueces River as its northeastern border, while the U.S. claimed the Rio Grande as the border. This disagreement over the border was the main spark for the war.

The Primary Cause of the Mexican-American War Was the Admittance