Convict lease system, which was popular in the South essentially leased convicts to large agricultural operations. This system led to many forms of abuse of workers who had lost their rights as a result of being convicted of a felony, whether guilty or not. This was particularly true for African Americans in the late-nineteenth century. One of the most notorious of these operations was Parchman Farm in Mississippi, which literally utilized thousands of black convicts for various unpaid tasks.
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James Watt- steam engine with condenser- used much less coal than earlier engines.
Henry Bessemer- Industrial process for steel production- made it cost efficient to produce steel from molten iron on a large scale.
Eli Whitney- Cotton gin- Allowed fibre to be extracted from seed more efficiently.
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In my opinion I think presidents should have their health evaluated instead of just a age. The maximum age shouldn’t be just a age it should be if the person can still function and run everything properly despite being older. Although if I had to set a age i would say 85.
When Germany demand Danzig but Poland refused so Germany declared war on them in 1939.