https://www.quora.com/What-gifted-musician-was-heavily-involved-in-the-1960s-Civil-Rights-Movement-with-Martin-Luther-King-and-Caeser-Chavez try this link, someone asked the question here
The increased efficiency of machines like this reduces the time it takes to perform the tasks each did by older methods or means. For example, using a washing machine is more efficient than hand washing clothing. And there is a major time-saving benefit.
Camel caravans from North Africa carried bars of salt as well as cloth, tobacco, and metal tools across the Sahara to trading centers like Djenne and Timbuktu on the Niger River. Some items for which the salt was traded include gold, ivory, slaves, skins, kola nuts, pepper, and sugar
The Government provided boats and rafts for them to move down the Tennessee River from Chattanooga to Ohio and then to Mississippi. When an epidemic of smallpox had broken out they were also given used blankets from the hospitals. They also provided some covering for them which they pulled over their heads to block the rain and sleet while they wait for the ice to lessen enough to cross the Mississippi.
<span> Both necessities and jewels were found at a public square in Temixtitlan.</span>
