Being the oldest and most effective original telegram, beacon towers are
the most important component of the defensive project on the Great
Wall. They are built continually to pass military messages. In ancient
times, if intruders approached, soldiers on the wall would create smoke
in the daytime and light a fire at night to warn their troops.
Im not 100% about the answer, but i think its Starvation.
Without resources or wealth they couldnt obtain food.
-Seth
D. the harsh winder led to thousands of cherokee deaths
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