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This ancient Mesoamerican civilization built its capital on an island in Lake Texcoco, connected to the mainland by causeways.
Difficulty: EasyThis massive subcontinent was often called the jewel in the crown of the British Empire due to its immense economic and strategic importance.
Difficulty: MediumThis emperor mutilated after a coup in 695 returned to power with Bulgar help in 705, ruling again until his murder in 711 during a chaotic period of instability.
Difficulty: HardThis Native American nation became the most powerful force on the Southern Plains after mastering the use of horses brought by Spanish colonizers.
Difficulty: EasyThis period of Dutch history, during which the VOC thrived, is known for great wealth, cultural achievement, and global trade dominance in the 17th century.
Difficulty: MediumThis adopted brother of Genghis Khan later became his chief judge and was entrusted with recording the empire's laws and history.
Difficulty: HardThis famous Roman structure, known for hosting gladiator battles and public spectacles, could seat around 50,000 spectators.
Difficulty: EasyThis ruler formed the original alliance in 1428, defeating the Tepanecs and establishing the foundation of the empire.
Difficulty: Medium