Answer:
D) salt
Explanation:
The salt is a mineral that is of great biological importance for the people. Not just that it is important, it also makes the food taste much better when added in it. This made the salt very popular and demanded among pretty much every civilization or tribe, meaning that the ones that were controlling the trade with the salt were able to have a lot of profit of it. The kingdoms of northern Africa had that chance and they used it. They were in excellent location to control the trade routes through which the salt was passing and was traded, so they were able to get a lot of wealth even though they were not the main producers of it.
<span>Blue Train is an upper class train (and a known
elite train in the whole world) in South Africa travelling from Pretoria to Cape
Town and vice versa. Its history began in 1923 connected to Union Limited and
Union Express trains which began in 1923. In 1947 (World War II), it stopped its
services and resumed on 1997.</span>
I am pretty sure its Cote d'Iviore.
Mechanical reaper 1834
Sewing machine 1830
Railroad 1830
Spinning Jenny 1770
revolutionise the process of cotton spinning
Cotton gin 1793 machine for cleaning cotton of seeds
Steam engine 1698. heat engine that performs mechanical work
Steel process 1856
Light bulb 1879
Radio waves 1895
Fixed wing planes 1799
Model t car assembly/line 1908
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