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Mesopotamia is between two rivers: Tigirs and Euphrates
In 1790, the national bank Hamilton established: national currency
By the time national currency was established, it mandated people who live in the country to only acknowledged the national currency as the standard medium of exchange for every transaction. This was a part of the agreement that was made on the Constitutional Convention on September 17, 1787.
The resources that were traded on the Trans-Saharan trade were salt, slaves, and religion. The West African countries were trading their gold for salt. The slaves were sent North and served as slaves or slave concubines. Islam was spread through the use of the Trans-Saharan trade route.