Final answer:
Countries employ different strategies to protect citizens from outside attacks such as building Great Walls and forming alliances.
Explanation:
Countries have organized to protect their citizens from outside attack through various means throughout history:
- Building Great Walls and guarding them from invaders. Example: China's Great Wall.
- Leading followers to safe areas protected by high mountains, wide rivers, or vast deserts. Example: England's protection by the English Channel.
- Forming alliances and fighting world wars for protection. Example: Governments in the 20th century.
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