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Superlative
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The Numbers
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Answer
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Most populous ancient city (pre-500 AD)
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~1,700,000
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Rome
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2nd most populous ancient city
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~1,000,000
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Alexandria
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War with the most U.S. fatalities
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~698,000
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U.S. Civil War
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War with the 2nd most U.S. fatalities
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~405,399
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World War II
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Largest empire by total land area
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35.5 Million km2
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British Empire
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2nd largest empire by total land area
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24.0 Million km2
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Mongol Empire
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Longest serving U.S. president
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4,422 days
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Franklin D. Roosevelt
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2nd longest serving U.S. president (12-way tie)
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2,922 days
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Thomas Jefferson | James Madison | James Monroe | Andrew Jackson | Ulysses S. Grant | Grover Cleveland | Woodrow Wilson | Dwight D. Eisenhower | Ronald Reagan | Bill Clinton | George W. Bush | Barack Obama
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Shortest serving U.S. president
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31 days
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William Henry Harrison
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2nd shortest serving U.S. president
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199 days
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James A. Garfield
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Country with the largest number of ancient pyramids
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200-255
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Sudan
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Country with the 2nd largest number of ancient pyramids
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~118
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Egypt
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Birth country of the most Popes (using modern boundaries)
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217
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Italy
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Birth country of the 2nd most Popes
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17
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France
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Country with the most individuals who have summited Mt. Everest (through 2025)
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2,135
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Nepal
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Country with the 2nd most individuals who have summited Mt. Everest
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883
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United States
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Deadliest conflict in world history
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75-80 million deaths
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World War II
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2nd or 3rd deadliest conflict in world history (name either)
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20-70 & 20-60 million deaths
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Taiping Rebellion | Mongol Invasions
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Country with the oldest written active constitution.
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426 years
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Monaco
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Country with the 2nd oldest written active constition.
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237 years
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United States
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Deadliest U.S. fire on October 8, 1871 (and deadliest wildfire in recorded history)
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1,200-1,500 deaths
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Peshtigo Fire
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2nd deadliest U.S. fire on October 8, 1871
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~300 deaths
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Great Chicago Fire
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Deadliest industrial disaster
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~22,000 deaths
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Bhopal
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2nd deadliest industrial disaster
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~16,000 deaths
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Chernobyl
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Deadliest peacetime maritime disaster (name either ship involved)
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4,386 deaths
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Doña Paz | MT Vector
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2nd deadliest peacetime maritime disaster
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1,514 deaths
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RMS Titanic
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Country that performed the most nuclear test explosions
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1,054
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United States
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Country that performed the 2nd most nuclear test explosions
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715
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Soviet Union
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Most career Olympic gold medals by one individual
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23
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Michael Phelps
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2nd most career Olympic gold medals by one individual
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11
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Johannes Høsflot Klæbo
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Location of largest amphibious invasion in history
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180,000 troops
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Okinawa (Operation Iceberg)
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Location of 2nd largest amphibious invasion in history
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150,000 troops
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Normandy (Operation Overlord)
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Country with the most aircraft carriers
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11
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United States
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Country with the 2nd most aircraft carriers
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3
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China
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Space telescope with the largest primary mirror
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6.5 meter diameter
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James Webb
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Space telescope with the 2nd largest primary mirror
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2.5 meter diameter
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Hubble
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