: Control over salt often led to wars and revolutions. For instance, Gandhi's Salt March in 1930 was a pivotal protest against British salt taxes in India.
: The quest for salt inspired early inventions, such as natural gas furnaces in ancient China and drilling techniques that eventually led to the petroleum age. Salt: A World History: Kurlansky, Mark - Books - Amazon.com
: Before modern refrigeration, salt's ability to preserve food was vital for long-distance travel and surviving seasons without fresh food, directly enabling the expansion of early civilizations.
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