Telephone - 1876
The telephone changed humanity by changing the way people communicate. Another thing the telephone did was increase communication over a distance so you can talk with someone that is not right next to you and talk like you are having a conversation instead of talking to someone through the mail system.
Typewriter - 1873
The typewriter changed humanity because it allowed for organization of documents. It helped organize documents by making them easier to read and having the text a consistent font. Another thing the typewriter did was open up many more jobs in offices.
Lightbulb - 1879
The lightbulb changed humanity by making light where it is needed. Before the lightbulb, people could not stay up at night due to having no light. Also, people could not work without light, so now with the lightbulb you could work when it is dark outside.
Airplane - 1903
The airplane changed humanity by being able to travel faster. The airplane made traveling safer and you could get to your destination a lot faster. It also changed humanity by being able to fly for the first time.
Handheld Camera (Kodak) - 1888
The first handheld camera changed humanity by being able to have a portable camera. Before this handheld camera, you had to carry around a huge camera. Now you can carry this around and take pictures without having to carry anything too heavy.
Practical Gasoline Engine - 1876
The gasoline engine changed humanity. It did this because now you could have a source of power for factories and automobiles. This went along with the discovery of oil and made a stronger engine.
Automatic Dishwasher - 1886
The automatic dishwasher changed humanity. It changed humanity by being able to wash dishes faster. It also made less work for the businesses that owned restaurants and normal people in general who did not have the time to wash dishes.
Gasoline Powered Automobile - 1893
The Gasoline Powered Automobile changed humanity. It changed it by being able to travel on ground without a horse. It also changed it because you could go faster than a horse and you could carry more things during travel.
Phonograph - 1877
The phonograph changed humanity. It changed humanity because it was the first invention that could be used for talking over a certain distance. It made it more convenient than to talk and meeting up with people to talk.
Automatic Lubricator - 1872
The Automatic Lubricator changed humanity. It changed it because now you could have less maintenence on the steam engines and still run faster than without the lubricator. Also it changed humanity because it allowed for faster traveling agents that used steam powered engines.