It was the invention of the cotton gin.
Answer:
Merriweather Lewis and William Clark are most known for their expedition from the Mississippi River to the West Coast and back. It was a long and dangerous journey that they both managed to complete and survive on.
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The steam engine of Thomas Newcomen and James Watt used the same principle of creating a vacuum and using steam to drive the device. The difference is that in James Watt's version, he uses a separate condenser to allow for a much greater efficiency in terms of power. The main difference with a separate condenser is that with a separate condenser, the main device can remain hot at all times, thus increasing efficiency.
They came from Southern and Eastern Europe.
