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When the neighboring empire attacks a Mongol caravan and Genghis Khan's envoys, he unleashes a campaign that annihilates the empire and solidifies Mongol dominance in Persia; he names his son Ogedei as his successor before his death.

Ogedei is proclaimed ruler of the Mongol Empire; he conquers Armenia, Georgia and the Jin Empire and builds the capital city of Karakorum.

Ogedei's death triggers a struggle for succession over the largest empire in the world.

Alaskans push their limits amid the warming tundra and melting landscape.

Alaskans embrace the flowing waters and returning wildlife of spring.

Alaskans must overcome rising waters to capitalize on spring's offerings.

Alaskans seek opportunities that come with spring, no matter the cost.

Hazards on the trail put the women's winter goals in jeopardy.