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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Answer: The Germans would provide military and financial support for a Mexican attack on the United States, and in exchange Mexico would be free to annex “lost territory in Texas, New Mexico and Arizona.” In addition, Von Eckardt was told to use the Mexicans as a go-between to entice the Japanese Empire to join the German .
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