Respuesta :
Answer:
The answer is D. Previously undiscovered precious metals in the new territories.
Explanation:
Answer: D. previously undiscovered precious metals in the new territories.
Logic: Options A, B, and C are wrong, so it must be option D.
Further Argument: In the lands that the U.S. acquired from the Mexican-American War, rich minerals such as gold, silver, and copper were found.