Yes, in general it is true that an important characteristic of civilization is economic activity, since without economic activity it is impossible to trade and grow the economy to the extent that people can develop new skills and trades.
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The mongols became an empire from the khan dynasty the mongols land was a vast steppe land filled to the brim with horses which made it easy for the mongols to expand because cavalry back then, especially horseback archers where a supremely good war weapon.
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Gibbon took September 4, 476 as a convenient marker for the final dissolution of the Western Roman Empire, when Romulus Augustus, the last Emperor of the Western Roman Empire, was deposed by Odoacer, a Germanic chieftain. Some modern historians question the significance of the year 476 for its end.
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To prevent one country from obtaining the upper hand, President McKinley's Secretary of State, John Hay, established the Open Door Policy. The goal of the policy was to allow all interested countries to trade openly in China.
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