What was a primary cause of the U.S.-Mexican War?

What was a primary cause of the U.S.-Mexican War?

• A. Conflicts over the purchase of California
• B. A dispute about navigation rights on the Mississippi
• C. Border disputes over Texas
• D. A trade disagreement with Mexico

Answer: (C)

Disputes over where a national border lies, especially after a territory changes hands, can spark war. The primary cause of the U.S.-Mexican War was the border quarrel over Texas after its annexation by the United States. The United States argued that the Texas-Mexico border was the Rio Grande, while Mexico claimed the border ran along the Nueces River farther north. When U.S. troops moved into the disputed area and Mexican forces clashed with them, war followed. This was tied to broader aims of westward expansion and Mexico’s long-standing refusal to accept Texas’s independence. Other issues like purchasing California, navigation rights on the Mississippi, or trade disputes were not the immediate trigger for this conflict.

Disputes over where a national border lies, especially after a territory changes hands, can spark war. The primary cause of the U.S.-Mexican War was the border quarrel over Texas after its annexation by the United States. The United States argued that the Texas-Mexico border was the Rio Grande, while Mexico claimed the border ran along the Nueces River farther north. When U.S. troops moved into the disputed area and Mexican forces clashed with them, war followed. This was tied to broader aims of westward expansion and Mexico’s long-standing refusal to accept Texas’s independence. Other issues like purchasing California, navigation rights on the Mississippi, or trade disputes were not the immediate trigger for this conflict.