Because Slate was more common in wet microclimates.
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The U.S. government openly stated that they would view any European interference in Latin America as "an act of aggression". This was articulated clearly in the Monroe Doctrine, which stated that the US would respond with military force.
The Federal Government receives finding from taxes coming out of salaries, which is called income tax. In the US especially, taxes contribute to the funding of Medicaid and social security benefits.
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You have to find what the letter stands for in an equation