The primary difference between barter and currency systems is that a currency system uses an agreed-upon form of paper or coin money as an exchange system rather than directly trading goods and services through bartering.
David Livingstone was a Scottish missionary, explorer, and anti-slavery advocate. He embarked upon several missions into Africa, venturing farther into the interior than previous European explorers. While trying to find the source of the Nile River, he became ill in what is now northern Zambia. After his death in 1873, Livingstone’s heart was removed and buried in the African soi
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It was the first major even in the military career of George Washington. It's important because it was the only time he ever surrendered to an enemy
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