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The war occurred because Mexico severed connenctions with the US after they (US) aquired Texas. On May 13th, Congress overwhelmingly approved a declaration of war. They entered the war divided. Democrats favored the conflict. Many viewed it as conscienceless land grabbing.
I think your answer would be c im not sure
The answer is last option
It is important in creating sustaining life all across the ocean. Up-welling is when deep cold water rises to the surface.
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Lincoln's major war aim was to preserve the Union, or the whole nation.
