Statistics for Top 20 Biggest Empires of All Time

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Million sq km	Year	Answer	% Correct
35.5	1920	British Empire	96%
24.0	1270 or 1309	Mongol Empire	81%
13.7	1810	Spanish Empire	81%
22.8	1895	Russian Empire	77%
6.5	1450	Ming Dynasty	31%
5.5	500BC	Achaemenid Empire	27%
14.7	1790	Qing Dynasty	23%
7.4	1942	Empire of Japan	19%
7.1	1640	Iberian Union	15%
11.1	720	Umayyad Caliphate	15%
11.1	750	Abbasid Caliphate	12%
6.5	100	Eastern Han Dynasty	12%
8.337	1889	Empire of Brazil	12%
6.0	557	First Turkic Khanate	12%
6.4	655	Rashidun Caliphate	12%
11.5	1920	Second French Colonial Empire	12%
6.0	50BC	Western Han Dynasty	12%
11.0	1310	Yuan Dynasty	12%
6.0	1310	Golden Horde Khanate	8%
9.0	176BC	Xiongnu Empire	8%