William Potts a police officer invented the traffic light and used the colors red, amber and green.
The Band-Aid was invented by Earl Dickson, because his wife was cutting herself.
James Cummings invented the bulldozer which looked like a tractor on treads.
The liquid fueled rocket was invented by Robert Hutchings Goddard as an armed weapon.
The was invented by the Automatic music company and was popular in the 1930s.
The ice tray was invented by Loyd Groff Copeman and the new type of ice was more popular than crushed ice.
Sam Foster Grant started producing sunglasses in the United States.