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alternatehistory.com
Greetings, gentlemen
In OTL, Rome felt at the begining of our era, whereas China was a powerful empire in far east... But could have history happened in another way, with an united western world under the banner of a more resistant but isolated roman empire and a few chinese states discovering the world a building an asiatic modernity ?
That's my challenge for you, be free to give any idea you have to make this situation plausible...