Answer: james k polk. which is a.
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explanation:
Henry David Thoreau opposed the Mexican War, so you could consider him an opponent of Manifest Destiny. Manifest Destiny was an overarching idea or concept, but it's practical application took place in many different events and contexts.
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Because we were to let immigrants in, of course that would encourage immigration... We are a mixing pot
The second one about it being created after the civil war
