Manifest Destiny and Expansion · US History

What was the primary cause of the Mexican-American War (1846-1848)?

  1. A dispute over the southern boundary of Texas between the Nueces and Rio Grande rivers
  2. The Mexican government's continued refusal to formally honor the Adams-Onís Treaty of 1819
  3. The discovery of gold at Sutter's Mill in California
  4. The execution of American settlers at the Alamo
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Correct answer: A dispute over the southern boundary of Texas between the Nueces and Rio Grande rivers

While tensions were high due to the annexation of Texas, the immediate spark was a border dispute. President Polk sent troops into the contested area between the rivers, leading to a military skirmish that he used to justify a declaration of war.

Difficulty: Medium Question 4 of 20

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