Despite its reputation for brutal warfare, the Mongol Empire briefly enabled peace, stability, trade, and protected travel under a period of “Pax Mongolica,” or Mongol peace, beginning in about 1279 and lasting until the empire's end. But Genghis Khan's death in 1227 ultimately doomed the empire he founded.
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Much of America saw great prosperity and stability during the 1950s, but poverty, racism and other social ills were widespread, though largely unseen by many
The Chinese constructed the "Great Wall of China." Some difficulties they had to face was possible invasion whilst they were vulnerable and focused on building the wall, invading animals, foreign lands, malfunctions with the building materials, (great stone blocks,) and possible death, since they were building in sometimes treacherous conditions.
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In 1887, the United States hosted the Centennial Exposition, an international exposition commemorating the 100th anniversary of the American Revolution.
