Answer :
Final answer:
The fighting spirit of the Americans during the Mexican-American War was motivated by Manifest Destiny, perceived threats from Mexico, and the desire for economic opportunities.
Explanation:
The fighting spirit of the Americans during the Mexican-American War was inspired by a variety of factors. Firstly, the idea of Manifest Destiny, which emphasized the expansion of American territory and influence, played a significant role in motivating Americans to fight. Secondly, the American government actively promoted the idea that Mexico was a threat to American security, which further fueled the fighting spirit of the American people. Lastly, the desire for economic opportunities and access to valuable resources, such as land and minerals, also played a part in motivating Americans to fight in the war.
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