For 500 years, When Zheng He's figure disappeared into the closed country gate, nine world powers gradually moved to the world stage. And one by one staged a different history of rise and fall.
Over the past 500 years, nine world powers have successively displayed their brilliance on the historical stage. From the great geographical discoveries of Spain and Portugal to the rise of the Soviet Union, Finally, Lexington's gunfire awakened the United States, which is still not declining today.