Probably the cotton gin invented by Eli Whitney. This machine revolutionized the south by cleaning cotton much faster than hand labor would.
the iphone
The most dramatic change in agriculture in the South was the invention of the cotton gin.
The cotton gin
Arrival of the Europeans.
it changed peoples lives because now you would have less slaves picking cotton and you can do it much more faster But in the south people wanted more slaves so they can do it fast to
Gunpowder
light bulb
Iron Bridge
Do you mean, what invention utilised during the Civil War changed combat? The rifle-barrelled cannon. Or the minie-ball. The post-war invention would have been the machine-gun.
It was an invention that changed the history of computers.
Invention? Whatever...
it changed the way we think on what to do
yes
the camera
agriculture
tesla
The answer to this question will forever remain a mystery. If you defined "his" or "invention," someone might be able provide a meaningful answer.