They all have their own jobs, and none is more important than another.
Johannes Gutenburg is the person you are looking for.
Manifest Destiny basically mean, "EVERYONE MOVE TO THE WEST NOW!" But with no slaves, how would they create farms to maintain themselves? Easy: expand slavery. However, this was battled against by several sources to create the Compromise of 1850. The compromise delayed the Civil War, despite politicians knowing it will eventually happen. It bought them time-- that was important! Other new states like Nebraska and Kansas were allowed to allow slavery or not. This eventually grew to where the North had no slavery and the South did, which lead to the Civil War.
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Social Darwinism describes the various theories that emerged in Western Europe and North America in the 1870s which applied biological concepts of natural selection and survival of the fittest to sociology, economics, and politics. Social Darwinism posits that the strong see their wealth and power increase while the weak see their wealth and power decrease. Different social Darwinist groups have differing views about which groups of people are considered to be the strong and which groups of people are considered to be the weak, and they also hold different opinions about the precise mechanisms that should be used to reward strength and punish weakness. Many such views stress competition between individuals in laissez-faire capitalism, while others were used in support of authoritarianism, eugenics, racism, imperialism, fascism, Nazism, and struggle between national or racial groups.