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It wasn't until 1874, when Illinois farmer Joseph Glidden emerged victorious from patent battle over a mechanically-produced fencing material that barbed wire could be made at scale. Glidden's machine pulled two strands of wire tight around the barb, then wound the wires together around the regularly-spaced spikes.
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Social Darwinists justified imperialism by saying that human evolution depended on these imperial powers taking control over other nations because of their superiority.
Answer: abolished slavery in the United States and provides that "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States
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