13. Colosseum
14. The Rhine and Danube
Answer:
Historians have identified several key causes, including: rats, trade networks such as the Silk Road, warfare such as the crusades, poor hygiene and a lack of medical understanding.
Explanation:
Maybe there were no cures, vaccines, or antibodies at the time. Medicine was never completely discovered for centuries to come, which is why the Black Plague occurred during the medieval/Middle Ages.
Supreme Court decision of Brown v Board of Education in 1954
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