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The mexican- ameircan war of 1846-1848 was justified in the opinions of many by

a. the monroe doctrine
b. manifest destiny
c. imperialism
d. isolationism

User Jasonhao
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The Mexican-American war of 1846-1848 was justified in the opinions of many by the idea of "Manifest Destiny", since this held that the US was "destined" to expand to the Pacific Ocean. 
User Kiya
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