In 1279, under the leadership of , the mongols completed the conquest of .

In 1279, under the leadership of Kublai Khan, the Mongols completed the conquest of the Song Dynasty/China.

Genghis Khan managed to conquer northern China, but Kublai Khan managed to conquer the last Song Dynasty in 1279.

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answer: born in saint-dié, in the vosges department, france, he studied law, and was called to the bar at paris in 1854,[2] but soon went into politics, contributing to various newspapers, particularly to le temps. he attacked the second french empire with great violence, directing his opposition especially against baron haussmann, prefect of the seine department. a series of his articles in le temps was later republished as the fantastic tales of haussmannlaxupa (1868).[2]

explanation:

the anwser is a) to prevent military conflict