Which mongol leader was know as "ruler of
all men" and first united the mongol tribes?
chang'an
kublai khan
yangdi
genghis khan

The correct answer is D) Genghis Khan

Explanation:

Genghis Khan was the most important military leader of the time and the person who brought together many small nomad tribes and build them into the most powerful Empire of it's time.

Genghis Khan's army was known for their strong horses and their archery techniques. Genghis was able to conquer large parts of modern China, Central Asia, Russia and reached up till modern Europe.

By the time of his death, Genghis Khan had the world's second largest Empire in history, second only to the British Empire.

Due to his vast Empire and the millions of subjects, he was known as the ''Ruler of all men''

ok sorry the answer is a. by their religion