AP US History Quiz
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PERIOD 5: 1844–1877
Question 1 of 20
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Secondary-source excerpt: Writing about the Mexican-American War (1846–1848), a historian argues that the conflict grew out of U.S. expansionism after the annexation of Texas and a dispute over whether the border lay at the Nueces River or the Rio Grande. The author adds that President Polk's decision to send troops into the contested zone helped trigger fighting, after which U.S. forces captured Mexico City and the Treaty of Guadalupe Hidalgo transferred vast northern Mexican territories to the United States.
Which statement best reflects the historian's interpretation of the war's primary cause?
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