Short answers, pulled from the story.
The city of Solnitsata in Bulgaria was established around 5400 BC. It stands as the oldest known city in Europe and existed entirely due to the extraction of salt from a nearby spring. Neolithic people boiled salt-laden water to create briquettes that fueled a population boom in the region.
The word salary derives from the Latin word for salt. The connection lies in the essential value of the mineral rather than the popular myth that Roman legions were paid directly in salt. This linguistic link reflects the historical importance of salt as a currency and medium of exchange.
The largest mine in the world is the Sifto mine in Goderich, Ontario. It operates 550 meters below Lake Huron and extracts seven million tons of salt each year. This facility feeds industrial needs for the chemical industry rather than human consumption.
The Roman general Scipio Aemilianus plowed over and sowed the city of Carthage with salt after its defeat in 146 BC. This story symbolizes the ultimate use of salt to prevent plant growth and ensure a city's eternal desolation. The event is now considered apocryphal but remains a powerful historical symbol.
The oppressive salt tax in France was reimposed by Napoleon to pay for foreign wars and lasted until 1946. The French Revolution was one of the primary causes of this tax, and Mahatma Gandhi led the Dandi March in 1930 to protest the colonial salt tax. This tax served as a tool of political control for centuries.