The right answer for the question that is being asked and shown above is that: "D. indirect democracy." The form of government is the us federal government is that of indirect democracy. That is, federal government is not that showing what a democratic country is.<span>
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The main way in which the railroads contributed to the end of the large buffalo herds was that "The railroad tracks were obstacles that the buffalo would not cross". It sounds silly, but the buffalo actually refused to cross the tracks for reasons that are still misunderstood.<span />
The Answer You're Looking For Is:
~D. Focused On Helping Poor African American Workers.
Hope this helps.