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What was Stephen A. Douglas's view on slavery?
Each state should decide whether to be a free or slave state.
Slavery should be prohibited in all new territories.
All enslaved Africans should be freed and granted citizenship.
The federal government should abolish slavery.

answer:

For a century and a half, historians have debated whether Douglas opposed slavery, and whether he was a compromiser or a devotee of principles. In his "Freeport Doctrine" of 1858, he repeatedly said that he did not care whether slavery was voted up or down, but only that the people had the right to vote it up or down.

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so. 

food chain i would say only because there is competition on getting food and survival