How did Kublai Khan become the Khan of Mongol Empire? There was a civil war between Kublai and his younger brother.
He was selected by Genghis Khan to be his heir.
Kublai overthrew Genghis Khan.
Kublai was elected by the people of the Mongol empire.

There was a civil war between Kublai and his younger brother.

Explanation:

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There was a civil war between Kublai and his younger brother.

Explanation:

Kublai Khan as Yuan Dynasty Emperor

His efforts paid off, with much of the Song imperial family surrendering to Kublai in 1276, but the war continued for another three years. In 1279, Kublai became the first Mongol to rule all of China when he conquered the last of the Song loyalists

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