#1 - The British Empire as they controlled 36.6 million km² of the Earth in 1922.
#2 - The Mongolian Empire as they controlled 33.2 million km² of the Earth in 1268.
#3 - The Russian Empire as they controlled 24.8 million km² of the Earth in 1866.
#4 - The Spanish Empire as the controlled 19 million km² of the Earth in 1788.
#5 - The Umayyad Arab Caliphate controlled 13.2 million km² of the Earth in 743 AD.
#6 - The Qing Empire. This could be counted as the Chinese Empire and controlled 13 million km² in 1760.
#19 The Roman Empire as they controlled 5.9 million km² in 117 AD.
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It depends on what time you're thinking of. The Roman empire began relatively small and then grew as Romans began their conquest of the area around them. This is why there are Roman walls in England still and why Italian, Spanish, and French are all Romance languages.
Ancient Chinese culture began with 4 relatively small groups of people all centered around the 2 most prominent rivers in China.
Modern China is much larger than modern Rome; it's only a city.
I wish I could be of more help to you but alas, there was not much of a question to go off of. If there were dates, I would be able to help you much more.
The Roman Empire became permanently divided and dissolved, whereas Han China collapsed but was eventually reunified under new leadership.
The empire in the west which was contemporary to the Han Dynasty was the Roman Empire.
The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.
The lesson is that the decline of a civilization is not simply the result of attack by outside invaders.
The larger an Empire becomes in area, the harder it is to control over time.