The Greatest Empire?

[jaichind]

A Chinese history discussion board I often read had a bunch of contributors come up with this list of top powers per time period.  I agree with most of it.

BC 2700-2650 year: 1 Egypt Third Dynasty, 2 Kish, Uruk 3, 4 Ur
BC 2650-2600 year: 1 Egypt Third Dynasty, 2 Ur, Kish 3, 4 Uruk
BC 2600-2550 year: 1 Egypt Forth Dynasty, 2 Elam, 3 Kish, 4 Uruk
BC 2550-2500 year: 1 Egypt Forth Dynasty, 2 Kish, 3 Lagash, 4 Hamas
BC 2500-2450 year: 1 Egypt Fifth Dynasty, 2 Lagash, 3 Umma, 4 Adab
BC 2450-2400 year: 1 Egypt Fifth Dynasty, 2 Lagash, 3 Uruk, 4 Kish
BC 2400-2350 year: 1 Egypt Firth Dynasty, 2 Akkadian Empire, 3 Umma, 4 Lagash
BC 2350-2300 Year: 1 Akkadian Empire, 2 Egypt Sixth Dynasty, 3 Ebla 3, 4 Ur
BC 2300-2250 year: 1 Akkadian Empire, 2 Egypt Sixth Dynasty, 3  Elam, 4 Mohenjo-daro
BC 2250-2200 Year: 1 Egypt Sixth Dynasty, 2 Akkadian Empire, 3 Elam, 4  Mohenjo-daro
BC 2200-2150 Year: 1 Egypt Ninth Dynasty , 2 Gutian Dynasty, 3 Lagash, 4 Uruk, 5 Mohenjo-daro
BC 2150-2100 Year: 1 Neo-Sumerian Empire, 2 Egypt Tenth Dynasty, 3 Mohenjo-daro, 4 Uruk, 5 Lagash
BC 2100-2050 year: 1 Neo-Sumerian Empire, 2 Egypt Eleventh Dynasty, 3 Egypt Tenth Dynasty, 4 Mohenjo-daro, 5 Elam
BC 2050-2000 year: 1 Egypt Eleventh Dynasty, 2 Elam, 3 Neo-Sumerian Empire, 4 Isin First Dynasty, 5 Mohenjo-daro
BC 2000-1950 year: 1 Egypt Twelfth Dynasty, 2 Isin First Dynasty, 3 Elam, 4 Larsa, 5 Anomarad Kingdom
BC 1950-1900 year: 1 Egypt Twelfth Dynasty, 2 Isin First Dynasty, 3 Larsa, 4 Elam, 5 Anomarad Kingdom
BC 1900-1850 year: 1 Egypt Twelfth Dynasty, 2 Isin First Dynasty, 3 Larsa, 4 Babylon, 5 Eshnunna
BC 1850-1800 year: 1 Egypt Twelfth Dynasty, 2 Larsa, 3 Isin First Dynasty, 4 Babylon, 5 Eshnunna
BC 1800-1750 Year: 1 Babylon, 2 Egypt Thirteenth Dynasty, 3 Assyrian Empire, 4 Elam, 5 Larsa
BC 1750-1700 Year: 1 Babylon, 2 Egypt Thirteenth Dynasty, 3 Sealand Dynasty, 4 Ekallatu, 5 Hittite Empire
BC 1700-1650 Year: 1 Babylon, 2 Egypt Fifteenth Dynasty, 3 Hittite Empire, 4 Knossos, 5 Sealand Dynasty
BC 1650-1600 Year: 1 Babylon, 2 Hittite Empire, 3 Egypt Fifteenth Dynasty, 4 Egypt Seventeenth Dynasty, 5 Knossos
BC 1600-1550 year: 1 Egypt Seventeenth Dynasty, 2 Hittite Empire, 3 Shang Dynasty, 4 Knossos, 5 Sealand Dynasty
BC 1550-1500 year: 1 Egypt Eighteenth Dynasty,  2 Babylon Third Dynasty, 3 Mitanni Kingdom, 4 Hittite Empire, 5 Knossos
BC 1500-1450 year: 1 Egypt Eighteenth Dynasty, 2 Mitanni kingdom, 3 Babylon Third Dynasty, 4 Hittite Empire, 5 Ugarit
BC 1450-1400 year: 1 Egypt Eighteenth Dynasty, 2 Hittite Empire, 3 Mitanni kingdom, 4 Babylon Third Dynasty, 5 Ugarit
BC 1400-1350 year: 1 Egypt Eighteenth Dynasty, 2 Hittite Empire, 3 Babylon Third Dynasty, 4 Assyrian kingdom, 5 Mycenae
BC 1350-1300 year: 1 Hittite Empire, 2 Egypt Eighteenth Dynasty,  3 Assyrian Empire, 4 Babylon Third Dynasty, 5 Mycenae
BC 1300-1250 year: 1 Egypt Nineteenth Dynasty, 2 Hittite Empire, 3 Shang Dynasty, 4 Mycenae, 5 Assyrian Empire
BC 1250-1200 year: 1 Egypt Nineteenth Dynasty, 2 Shang Dynasty, 3 Assyrian Empire, 4 Mycenae, 5 Elam
BC 1200-1150 year: 1 Egypt Twentieth Dynasty, 2 Elam, 3 Shang Dynasty, 4 Babylon Fourth Dynasty, 5 Assyrian Empire
BC 1150-1100 year: 1 Babylon Fourth Dynasty, 2 Egypt Twentieth Dynasty, 3 Shang Dynasty, 4 Elam, 5 Assyrian Empire
BC 1100-1050 year: 1 Assyrian Empire, 2 Shang Dynasty, 3 Egypt Twenty first Dynasty, 4 Babylon Fourth Dynasty, 5 Damascus
BC 1050-1000 year: 1 Chou Dynasty, 2 Egypt Twenty-First Dynasty, 3 Philistines, 4 Damascus, 5 Babylon Fourth Dynasty
BC 1000 - 950 year: 1 Chou Dynasty, 2 Egypt Twenty-First Dynasty, 3 Israel, 4 Tyre, 5 Sidon, 6 Babylon Eighth Dynasty
BC 950 - 900 year: 1 Chou Dynasty, 2  Egypt Twenty-Second Dynasty, 3 Neo-Assyrian Empire, 4 Israel, 5 Tyre, 6 Babylon Ninth dynasty
BC 900 - 850 Year: 1 Neo-Assyrian Empire, 2 Chou Dynasty, 3 Egypt Twenty-Second Dynasty, 4 Tyre, 5 Damascus, 6 Babylon Ninth dynasty
BC 850 - 800 Year: 1 Neo-Assyrian Empire, 2 Chou Dynasty, 3 Urartu, 4 Tyre, 5 Egypt Twenty-Second Dynasty, 6 Damascus
BC 800 - 750 Year: 1 Urartu, 2 Neo-Assyrian Empire, 3 Chou Dynasty, 4 Egypt Twenty-Second Dynasty, 5 Egypt Twenty-Second Dynasty, 6 Babylon Ninth dynasty
BC 750 - 700 Year: 1 Neo-Assyrian Empire, 2 Egypt Twenty-Fifth Dynasty, 3 Urartu, 4 Elam, 5 Duchy of Zheng, 6 Chou Dynasty
BC 700 - 650 Year: 1 Neo-Assyrian Empire, 2 Medes, 3 Duchy of Chi, 4 Egypt Twenty-Fifth Dynasty, 5 Urartu, 6 Kingdom of Chu, 7 Argos, 8 Tyre, 9 Elam, 10 Duchy of Jin, 11 Duchy of Lu, 12 Chalcis, 13 Carthage
BC 650 - 600 year: 1 Medes, 2 Neo-Babylonian Empire, 3 Neo-Assyrian Empire, 4 Egypt Twenty-Six Dynasty 5 Duchy of Jin, 6 Lydia 7 Kingdom of Chu, 8 Lydia, 9 Meroë, 10 Benares, 11 Duke of Chin, 12 Carthage, 13 Megara, 14 Duke of Sung
BC 600 - 550 year: 1 Neo-Babylonian Empire, 2 Medes, 3 Lydia, 4 Egypt Twenty-Six Dynasty, 5 Kingdom of Chu, 6 Duchy of Jin, 7 Kosala, 8 Carthage, 9  Lydia, 10 Magadha, 11 Kush, 12 Cyrene, 13 Duke of Chi, 14 Argos
BC 550 - 500 Year: 1 Persian Empire, 2 Carthage, 3 Duchy of Jin, 4 Magadha, 5 Kosala, 6 Kingdom of Wu, 7 Sparta, 8 Kingdom of Chu, 9 Corinth, 10 Egypt Twenty-Six Dynasty, 11 Athens, 12 Duke of Chi
BC 500 - 450 Year: 1 Persian Empire, 2 Athens, 3 Sparta,  4 Magadha, 5 Syracuse, 6 kingdom of Yue, 7 Carthage, 8 Kingdom of Chu, 9 Meroë, 10 Etrusca, 11 Sheba
BC 450 - 400 Year: 1 Persian Empire, 2 Sparta, 3 Athens, 4 Magadha, 5 Kingdom of Wei, 6 Syracuse, 7 Carthage, 8 Roman Republic, 9 Kingdom of Chu, 10 Thebes, 11 Meroë, 12 Cyrene
BC 400 - 350 year: 1 Persian Empire, 2 Magadha, 3 Carthage, 4 Thebes, 5 Macedonia, 6 Kingdom of Wei, 7 Kingdom of Chi, 8 Roman Republic, 9 Meroë, 10 Odrysian kingdom, 11 Kingdom Chu, 12 Egypt Thirtieth Dynasty, 13 Sparta, 14 Kingdom Chin
350 BC - 300 years: 1 Macedonia, 2 Maurya Empire, 3 Persian Empire, 4 Carthage, 5 Kingdom of Chi, 6 Kingdom of Chin, 7 Roman Republic, 8 Seleucid kingdom, 9 Ptolemaic Kingdom, 10 Aetolian League, 11 Kalinga, 12 Kingdom of Chu, 13 Bosporan Kingdom
BC 300 - 250 Year: 1 Maurya Empire, 2 Seleucid kingdom, 3 Ptolemaic Kingdom, 4 Kingdom of Chin, 5 Roman Republic, 6 Carthage, 7 Macedonia, 8 Kingdom of Chao, 9 Aetolian League, 10 Epirus, 11 Meroë, 12 Thrace, 13 Kalinga
BC 250 - 200 Year: 1 Maurya Empire, 2 Chin Dynasty, 3 Roman Republic, 4 Seleucid kingdom, 5 Ptolemaic Kingdom, 6 Parthian Empire, 7 Macedonia, 8 Carthage , 9 Xiongnu, 10 Achaean League, 11 Aetolian League, 12 Yuezhi
BC 200 -150 Year: 1 Western Han Dynasty, 2 Roman Republic, 3 Xiongnu, 4 Parthian Empire, 5 Seleucid kingdom, 6 Numidia, 7 Shunga Empire, 8 Ptolemaic Kingdom, 9 Macedonia, 10 Bactria, 11 Meroë, 12 Achaean League, 13 Nanyue
BC 150 -100 Year: 1 Western Han Dynasty, 2 Roman Republic, 3 Parthian Empire, 4 Xiongnu, 5 Numidia, 6 Ptolemaic Kingdom, 7 Seleucid kingdom,  8  Pontus, 9 Indo-Greek Kingdom, 10 Mauritania, 11 Shunga Empire, 12 Meroë
BC 100 - 50 Year: 1 Western Han Dynasty, 2 Roman Republic, 3 Parthian Empire, 4 Xiongnu, 5 Armenia, 6 Ptolemaic Kingdom, 7 Dacia, 8 Mauritania, 9 Meroë, 10 Wusun, 11 Nabataean Kingdom, 12 Kanva dynasty
BC 50 - 1 Year: 1 Western Han Dynasty 2 Roman Empire, 3 Parthian Empire, 4 Xiongnu, 5 Andhra, 6 Mauritania, 7 Meroë, 8 Kingdom of Judah, 9 Britian, 10 Ptolemaic Kingdom, 11 Armenia

[jaichind]

1 - 50 Year: 1 Roman Empire, 2 Eastern Han Dynasty, 3 Parthian Empire, 4 Xiongnu, 5 Kushan Empire, 6 Meroë, 7 Andhra, 8 Germanic alliance, 9 Indo-Parthian Kingdom, 10 Mauritania,  11 Nabataean Kingdom, 12 Axum, 13 Kangju
50 - 100 Year: 1 Eastern Han Dynasty, 2 Roman Empire, 3 Parthian Empire, 4 Kushan Empire, 5 Andhra, 6 Northern Xiongnu, 7 Dacia , 8 Meroë, 9 Axum, 10 Kangju
100 -150 Year: 1 Roman Empire, 2 Eastern Han Dynasty, 3 Kushan Empire, 4 Parthian Empire, 5 Andhra, 6 Northern Xiongnu, 7 Meroë, 8 Axum, 9 Kalinga, 10 Chola
150 - 200 Year: 1 Roman Empire, 2 Eastern Han Dynasty, 3 Kushan Empire, 4 Parthian Empire, 5  Hsienpi Khanate, 6 Kalinga, 7 Andhra, 8 Meroë, 9 Axum, 10 Chola
200 - 250 Year: 1 Sassanian Persia, 2 Roman Empire, 3 Wei Dynasty, 4 Kushan Empire, 5 Wu Dynasty, 6 Shu Han Dynasty, 7 Axum, 8 Funan, 9 Meroë, 10 The Western Satraps
250 - 300 Year: 1 Roman Empire, 2 Western Jin Dynasty, 3 Sassanian Persia, 4 Armenia, 5 Axum, 6 Wu Dynasty, 7 Funan, 8 Lakhmids 9 Alemanni, 10 Arabia, 11 Palmyra, 12 Shu Han Dynasty, 13 Gallic Empire
300 - 350 Year: 1 Roman Empire, 2 Sassanian Persia, 3 Gupta Empire 4 Axum, 5 Eastern Jin Dynasty, 6 Funan, 7 Later Zhao Dynasty, 8 Early Zhao Dynasty, 9 Vakataka Dynasty, 10 Greuthungi, 11 Early Yen Dynasty
350 - 400 Year: 1 Gupta Empire 2 Sassanian Persia, 3 Roman Empire, 4 Axum, 5 Early Chin Dynasty, 6 Eastern Jin Dynasty, 7 Hunnic Empire, 8 Makuria, 9 Nubia, 10 Champa, 11 Vakataka dynasty
400 - 450 Year: 1 Sassanian Persia, 2 Gupta Empire, 3 Hunnic Empire, 4 Byzantine Empire, 5 Northern Wei Dynasty, 6 Liu Song Dynasty, 7 Western Roman Empire, 8 Axum, 9 Vakataka Dynasty, 10 Avars, 11 Visigoth Kingdom, 12 Vandals Kingdom, 13 Tuyuhun, 14 Lakhmids
450 - 500 Year: 1 Northern Wei Dynasty, 2 Sassanian Persia, 3 Byzantine Empire, 4 Hephthalite Empire, 5 Gupta empire, 6 Southern Chi Dynasty, 7 Visigoth Kingdom, 8 Vandals Kingdom, 9 Koguryo Kingdom, 10 Odoacer Kingdom, 11 Axum, 12 Teotihuacan, 13 Burgundy
500 - 550 Year: 1 Byzantine Empire, 2 Sassanian Persia, 3 Ostrogothic Kingdom, 4 Southern Liang Dynasty, 5 Hephthalite Empire, 6 Avars, 7 Northern Wei Dynasty, 8 Axum, 9 Frankish kingdom, 10 Teotihuacán, 11 Koguryo, 12 Visigoth kingdom, 13 Ghassanid Kingdom
550 - 600 Year: 1 Sui Dynasty, 2 Byzantine Empire, 3 Sassanian Persia, 4 Turkic Khanate, 5 Visigoth kingdom, 6 Southern Chen Dynasty, 7 Northern Chi Dynasty, 8 Frankish kingdom, 9 Harsha Empire, 10 Lombard kingdom, 11 Axum, 12 Teotihuacan
600 - 650 Year: 1 Tang Dynasty, 2 Rashidun Caliphate, 3 Harsha Empire, 4 Byzantine Empire, 5 Sassanian Persia, 6 Western Turks Khanate, 7 Frankish kingdom, 8 Visigoths Kingdom, 9 Kingdom of Lombard, 10 Pyu city-states, 11 Eastern Turkic Khanate, 12 Koguryo, 13 Calakmul
650 - 700 Year: 1 Tang Dynasty, 2 Umayyad Caliphate, 3 Byzantine Empire, 4 Tibet, 5 Bulgaria, 6 Frankish kingdom, 7 Silla, 8 Japan, 9 Lombard Kingdom, 10 Visigothic Kingdom, 11 Chenla, 12 Calakmul
700 - 750 Year: 1 Umayyad Caliphate, 2 Tang Dynasty, 3 Byzantine Empire, 4 Tibet, 5 Frankish kingdom, 6 Bulgaria, 7 Lombard kingdom, 8 Later Turkic khanate, 9 Chalukya dynasty, 10 Tikal, 11 Nanzhao, 12 Silla, 13 Kingdom of Asturias
750 - 800 Year: 1 Abbasid Caliphate, 2 Tang Dynasty,3 Charlemagne Empire, 4 Byzantine Empire, 5 Tibet, 6 Emirate of Córdoba, 7 Tikal, 8 Shailendra dynasty, 9 Rashtrakuta Dynasty, 10 Uighur Khanate, 11 Japan, 12 Pala Empire
800 - 850 Year: 1 Abbasid Caliphate, 2 Tang Dynasty, 3 Charlemagne Empire, 4 Byzantine Empire, 5 Tibet, 6 Pala Kingdom, 7 Emirate of Córdoba, 8 Aghlabids Dynasty, 9 Ghana, 10 Bohai, 11 Bulgaria, 12 Tahirid dynasty, 13 Pratiharas Empire
850 - 900 Year: 1 Byzantine Empire, 2 Abbasid Caliphate, 3 Tang Dynasty, 4 Bulgaria, 5 Pratiharas Empire, 6 Srivijaya, 7 Tulunid Egypt, 8 Aghlabids Dynasty , 9 Emirate of Córdoba, 10 Samanid Empire, 11 Nanzhao, 12 Ghana, 13 Saffarid dynasty
900 - 950 Year: 1 Caliphate of Córdoba, 2 Bulgaria, 3 Byzantine Empire, 4 Liao Dynasty, 5 Samanid Empire, 6 East Frankish kingdom, 7 Abbasid Caliphate, 8 Later Tang Dynasty 9 Kingdom of Wessex, 10 Srivijaya, 11 Fatimid Caliphate, 12 Ghana, 13 Qarmatians, 14 Rashtrakuta Dynasty
950-1000 Year: 1 Byzantine Empire, 2 Northern Sung Dynasty, 3 Holy Roman Empire, 4 Liao Dynasty, 5 Fatimid Caliphate, 6 Caliphate of Córdoba, 7 Kievan Rus, 8 Kara-Khanid Khanate, 9 Japan, 10 Ghana, 11 Bulgaria, 12 Buyid Dynasty
1000-1050 Year: 1 Northern Sung Dynasty, 2 Byzantine Empire, 3 Liao Dynasty, 4 Seljuk Empire, 5 North Sea Empire, 6 Silla, 7 Ghaznavid, 8 Fatimid Caliphate, 9 Holy Roman empire, 10 Western Hsia Dynasty, 11 Kievan Rus, 12 Ghana
1050-1100 Year: 1 Seljuk Empire, 2 Northern Sung Dynasty, 3 Byzantine Empire, 4 Liao Dynasty, 5 Holy Roman Empire, 6 Silla, 7 Almoravid dynasty, 8 Hungary, 9 England, 10 Pagan Kingdom, 11 Fatimid Caliphate, 12 Goryeo, 13 Western Hsia Dynasty
1100-1150 year: 1 Jin Dynasty, 2 Byzantine Empire, 3 Holy Roman Empire, 4 Khmer Empire, 5 Southern Sung Dynasty, 6 Western Liao Dynasty, 7 Seljuk Empire, 8 Fatimid Caliphate, 9 Kingdom of Jerusalem, 10 Chichen Itza, 11 Almohad Caliphate, 12 Hungary
1150-1200 year: 1 Ayyubid dynasty, 2 Jin Dynasty, 3 Almohad Caliphate, 4 Southern Sung, 5 Holy Roman Empire, 6 Western Liao Dynasty, 7 Ghurid dynasty, 8 Byzantine Empire, 9 England, 10 Khmer Empire, 11 France, 12 Western Hsia Dynasty
1200-1250 year: 1 Mongol Empire, 2 Southern Sung Dynasty, 3 France, 4 Holy Roman Empire, 5 Delhi Sultanate, 6 Empire of Nicaea, 7 Khwarazmian Empire, 8 Ayyubid dynasty, 9 Sultanate of Rum, 10 Kanem Empire, 11 Japan, 12 Maya, 13 Mali, 14 Tuʻi Tonga Empire
1250-1300 year: 1 Yuan Dynasty, 2 Mamluk Sultanate, 3 France, 4 Genoa, 5 Ilkhanate, 6 Golden Horde, 7 Delhi Sultanate, 8 Japan, 9 Hafsid dynasty, 10 Dai Viet, 11 England, 12 Byzantine Empire, 13 Srivijaya, 14 House of Ögedei
1300-1350 year: 1 Yuan Dynasty, 2 Delhi Sultanate, 3 Mamluk Sultanate, 4 Golden Horde, 5 Ottoman Empire, 6 England, 7 Mali, 8 France, 9 Majapahit, 10 Serbia, 11 Ilkhanate, 12 Holy Roman Empire, 13 Genoa, 14 Marinid dynasty
1350-1400 year: 1 Timurid dynasty, 2 Ming Dynasty, 3 Ottoman Empire, 4 Majapahit, 5 Delhi Sultanate, 6 Hungary, 7 Northern Yuan Dynasty, 8 England, 9 Mamluk Sultanate, 10 Holy Roman Empire, 11 France, 12 Venice, 13 Siam, 14 Tlacopan
1400-1450 year: 1 Ming Dynasty, 2 Ottoman Empire, 3 Venice, 4 France, 5 Poland-Lithuania, 6 Oirats, 7 England, 8 Kalmar Union, 9 Japan, 10 Korea, 11 Timurid Empire, 12 Holy Roman Empire, 13 Mamluk Sultanate, 14 Castile
1450-1500 year: 1 Ming Dynasty, 2 Ottoman Empire, 3 France, 4 Spain, 5 Songhai Empire, 6 Inca Empire, 7 Aztec Empire, 8 Ag Qoyunlu, 9 Portugal, 10 Mozambique, 11 Venice, 12 Poland-Lithuania, 13 Hungary, 14 Dai Viet
1500-1550 year: 1 Spain, 2 Ottoman Empire, 3 Ming Dynasty, 4 Portugal, 5 France, 6 England, 7 Mughal Empire, 8 Holy Roman Empire, 9 Safavid dynasty, 10 Tartar Khanate, 11 Muscovy, 12 Songhai Empire, 13 Kazakh Khanate, 14 Florence
1550-1600 year: 1 Spain, 2 Ming Dynasty, 3 Mughal Empire, 4 Ottoman Empire, 5 England,  6 Portugal, 7 Japan, 8 Safavid dynasty, 9 France, 10 Bornu Empire, 11 Holy Roman Empire, 12 Russia, 13 Poland-Lithuania, 14 Saadi Dynasty
1600-1650 year: 1 Mughal Empire, 2 France, 3 Ottoman Empire, 4 Ming Dynasty, 5 Safavid dynasty, 6 Dutch Republic, 7 Spain, 8 Later Jin Dynasty, 9 Holy Roman Empire, 10 Taungoo Dynasty, 11 England, 12 Sweden, 13 Japan, 14 Bornu Empire
1650-1700 year: 1 Ching Dynasty, 2 France, 3 Dutch Republic, 4 Mughal Empire, 5 Ottoman Empire, 6 England, 7 Sweden, 8 Spain, 9 Austria, 10 Alaouite dynasty, 11 Russia, 12 Safavid dynasty, 13 Dzungar Khanate, 14 Poland-Lithuania
1700-1750 year: 1 Ching Dynasty, 2 France, 3 UK, 4 Russia, 5 Ottoman Empire, 6 Austria, 7 Prussia, 8 Dutch Republic, 9 Spain, 10 Dzungar Khanate, 11 Afsharid dynasty, 12 Portugal, 13 Japan, 14 Oyo Empire
1750-1800 year: 1 UK, 2 Russia, 3 Ching Dynasty, 4 France, 5 Prussia, 6 Austria, 7 Ottoman Empire, 8 Spain, 9 Dutch Republic, 10 Portugal, 11 USA, 12 Denmark-Norway, 13 Japan, 14 Durrani dynasty
1800-1850 year: 1 UK, 2 Russia, 3 France, 4 Ching Dynasty, 5 Prussia, 6 Austria, 7 USA, 8 Ottoman Empire, 9 Spain, 10 Netherlands, 11 Sardina, 12 Muhammad Ali dynasty, 13 Qajar dynasty, 14 Japan
1850-1900 year: 1 UK, 2 Germany, 3 USA, 4 France, 5 Russia, 6 Japan, 7 Austro-Hungarian Empire, 8 Italy, 9 Ching Dynasty, 10 Ottoman Empire, 11 Belgium, 12 Netherlands, 13 Spain
1900-1950 year: 1 USA, 2 Germany, 3 USSR, 4 UK, 5 France, 6 Japan, 7 Italy, 8 China, 9 Poland, 10 Spain, 11 Argentina, 12 Belgium, 13 Czechoslovakia, 14 Switzerland
1950-2000 year: 1 USA, 2 USSR, 3 Japan, 4 Germany, 5 France, 6 UK, 7 PRC, 8 Italy, 9 India, 10 Brazil, 11 Canada, 12 Australia, 13 Spain, 14 ROK

[jaichind]

If we continue this and use national power index (NPI) we have for

2000 - 2016 year:  1 USA, 2 PRC, 3 Russia, 4 France, 5 Japan, 6 UK, 7 Germany, 8 India, 9 Canada, 10 Israel

[jaichind]

I would argue that Achaemenid Persia is the greatest empire ever.  At its peak slightly over half the human population in the world was within the borders of Achaemenid Persia.  This is a record that has never been exceeded by any other political entity.