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The smallpox epedemic originated in the Eurasian area. You can also date it back to the plague of Athens around 430 bc. The earliest date is unknown, but said to be before 430 bc. In the 1770's, 30% of the west coast native americans died. In 1674, half of the cherokee tribe died of smallpox. From 1617-1619, 90% of the machusetts bay indians died. Smallpox is a devestating plague that still affects many today