In the United States, the Constitution is the ultimate "law of the land," meaning that the federal government has sovereignty over the states--although some powers are "shared".
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.
Answer: The end of the First World War marked the beginning of a period of political and economic instability in Germany.
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