: 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.
: Salt was once so valuable it was used as currency; the Roman practice of paying soldiers in salt is the origin of the word "salary" and the expression "worth his salt". Salt: A World History
: 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. : Control over salt often led to wars and revolutions