What was the most catastrophic event in recorded history that nearly wiped out civilizations and significantly reduced human populations?

The most catastrophic event in **recorded history** that nearly wiped out civilizations—and significantly reduced human populations—was the **Plague of Justinian (541–549 AD)** followed by the **Black Death (1346–1353 AD)**. ### **1. Plague of Justinian (541–549 AD)** - **Death Toll:** Estimated **25–50 million** (up to **50% of Europe's population**). - **Impact:** Devastated the Byzantine Empire, crippled economies, and contributed to its decline. ### **2. Black Death (1346–1353 AD)** - **Death Toll:** **75–200 million** (killed **30–60% of Europe's population**). - **Impact:** Collapsed feudal systems, caused labor shortages, and led to massive societal upheaval. These pandemics were caused by *Yersinia pestis* (bubonic plague) and were so deadly that some settlements were completely abandoned. While not extinction-level, they came closest in recorded history to erasing civilizations. For comparison, **World War II (1939–1945)** killed ~**70–85 million**, but its impact was more localized than these plagues. Would you like a deeper breakdown of how these events reshaped societies?