<span>Britain had developed radar stations to detect German aircraft</span>
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After the Civil War, the nation was still greatly divided because the South had been devastated physically and spiritually. Besides the destruction of the land, homes, and cities, no confederate soldiers were allowed burial in Arlington Cemetery, and many of their bodies were lost to their families
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I'm not sure about the Hellenistic society, but the Greek Civilization contributed a lot to our world today. Many philosophers like Plato and Socrates still have sayings that are used today. Architeture played a huge role. I'm fairly certain the Greeks named a ton of the constellations.
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I hope this helps a little bit. You can always research more.
Stones, sharp rocks, wood, & animal bones.