What Was the Largest Contiguous Empire in History?

The Mongol Empire, founded by Genghis Khan in 1206, was the largest contiguous land empire in world history. Originating from the Mongol heartland in the Steppe of central Asia, by the late 13th century it spanned from the Pacific Ocean in the east to the Danube River and the shores of the Persian Gulf in the west.

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seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.