Ghana, Mali, and Songhai were known as the Kingdoms of Salt and Silk. Jewels and Tea. Gold and Jewels. Salt and Gold.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

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step-by-step explanation:

the roman empire began to fall