Slavery was THE great debate of the 1850's as was the question of continuing a union that threatened the lives and property of the South. It caused Lincoln's election in 1860 and fueled the movement to secession and war. Slavery was the dividing point over which there was a limit to the compromises that could be effected. It clearly drove the decade as it had shaped the whole century.
Social Darwinism explained the operation of society as "survival of the fittest."
People often associate the term "survival of the fittest" with Charles Darwin, but actually it was terminology that came from Herbert Spencer, the founder of what is known as Social Darwinism. (Spencer wouldn't have called it that - he and Darwin were rivals.) Darwin used the term "natural selection" in his descriptions of biological evolution. Spencer was unafraid to apply the same concepts to competition within the human species, contending that the stronger, fitter social or cultural groups will survive better than others and dominate over weaker groups.
When Pope Urban wanted to wage war against Muslims in the "holy land" Below is a map of the first crusade.
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Social Darwinism and American Laissez-faire Capitalism British philosopher Herbert Spencer went a step beyond Darwin's theory of evolution and applied it to the development of human society. In the late 1800s, many Americans enthusiastically embraced Spencer's "Social Darwinism" to justify laissez-faire, or unrestricted, capitalism.
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Equality of women he made their rights even less