answer : foreign infectious deceases, like small pox
Explanation:
to quote some artical i found when looking uo a proper answer to this, "By far the most drastic upheavals were caused by invisible invaders, the foreign bacteria introduced from the Old World. Native populations cut off from Europe, Africa, and Asia for millennia were utterly without immunity to smallpox, measles, and other ailments the newcomers unwittingly brought across the seas. "
The Spindletop oilfield, discovered on a salt dome formation south of Beaumont in eastern Jefferson County on January 10, 1901, marked the birth of the modern petroleum industry.
