This is probably biological warfare because it's not allowed according to the Geneva congress. Using poisons, toxic matters, viruses and bacteria, as well as flamethrowers and things like that are forbidden or else it will be considered a war crime and people will answer for it. It was practiced in World War 1 but was forbidden after.
The correct answer should be A. President Polk wants to make Texas and California U.S territories.
I am not very sure and I might be wrong but I’m pretty sure that it is C.
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Maize was not brought to America