The America has been a world's pioneer in science and technology after 1940's due to the very competition between all countries of the world. This competition arised due to the world at that time was witnessing the downfall of British Empire and need to be technically advanced to sustain autonomy amongst the various countries competing in technology advancement.
Various Inventions had taken place and the most important of all the atomic bomb which had a great impact on world war 2 when "little boy" and "fat man" named two atomic bomb samples were dropped in Japan as a retaliation for Japan's attack on Pearl Harbour.
Following are some important inventions in America post 1940's:
1940- Jeep Invented- Military forces in America needed fast movement in warzone areas on rough surfaces, Karl Pabst inveted the jeep
1940- Waldo Semon invented a best in quality and more cheaper method of sythetic rubber
08/23/1940- The color television provided colours to the filming visions invented by Peter Goldmark that has boosted the television industries as every home wanted a couple of television sets.
1941- Aerosol Spray cans Lyle David and Sullivian Aeroso spray cans to dispense bug repellant.
1943- Jacques Costeau invented the Scuba suit that would help America to discover the misteries and treasures of deep oceans.
1943- Richard and James Wright invented the Slinky and Silly putty that would bring industrial development in art and craft industry for America.
07/16/1945- The atomic bomb was invented and was tested by the Manhattan Project.
10/08/1945-Percy Spencer accidentally discovered the cooking properties of Microwaves radiations.
12/23/1947- The trasistors added the needed specimen for the growth of computer microchip industries and a vision of today's zenith for the silicon valley. Bardeen and Walter invented transistors.
1948- Electrical engineer George invented Velcro and patented.
1942- Super Glue was invented.
1952- Diet soda was invented by Kirsch Bottling for diabetics.
1952- The first Video tape recorder was invented by BBC.
11/1/1952- The Hydrogen Bomb which was about 10,000 times stronger than atomic bombs on 1947 was invented by Edward and Stanislaw.
1954- The first oral contraceptive pills were successful;
15/05/1955- The Mc Donald's franchise grew exponentially in provided food facilities to the world.
1956- The computer hard drives revolutionised the computer manufacturing industry which was invented by IBM company.
1958- Charles and Arthur Patented the laser light after their regorious experiments at Bell laboratories.
1958- The U.S military system uses Modem for their air defence system.
1958- Earl Bakken invents the Pacemaker.
09/12/1958- The Integrated chips were Invented in America.
1962- Phillips a company invents the audio storing device for the fist time on American soil call Cassatte.
1962- Outstanding Game Spacewar was developed that had brought focus on trillion dollar gaming industry,
1963- The video disc was invented which could show audio and video recordings on a screen.
1964-Rowney developed a fast drying and water based paint called Acrylic paint.
1967- First hand held Calculator was invented by Texes instruments.
1968-Robert H. Dennard invented the Random Access Memory that had improved computers.
1969- Borroughs Corporation brings out the Automatic Teller Machine that had got transactions smoother for economic growth of the country.
1969- Barcode was installed by Buick Factory for the first time.
1971- The most compact storage device at that time Floppy was invented
1971- The first Microprocessor was invented making leaps in computer technology
1972-The Orbiting Astronomical Observatory 3 (OAO-3), or, Copernicus satellite is launched by NASA on August 21st, 1972.
1973-the General Motors research team invented the first car safety air bags that were first offered in the Chevrolet as an option.
1974-The Mark-8 microcomputer based on the Intel 8008 microprocessor is designed by Jonathan Titus.
1976.The Apple Computer Company was established by Steve Jobs and Steve Wozniak during April of 1976.
1977-The first all-in-one personal computer, the Commodore PET, was introduced as a prototype at the Consumer Electronics Show during January of 1977
1978- Winglet attached to the tip of a Continental Airlines Boeing 757 wings were introduced.
1979-The Walkman virtually invented the concept of "personal electronics."
1980-The IBM PC. The IBM PC, also known as model number 5150, was released in 1981 and changed the business world.
1982-Disposable Camera was developed.
1983 - ARPANET officially changes to use the Internet Protocol, creating the Internet.
1984-The Apple Macintosh. The first mass-marketed personal computer featured a graphical user interface and mouse
1985- Compact Disc read-only memory (CD-ROM) was invented in 1985
1986- Chuck Hull, known as the father of 3D printing, patented his stereolithography technique
1989-The world wide web was invented by Tim Berners-Lee.
1990-Hubble Space Telescope Modern astronomy is epitomized by the Hubble Space Telescope.
1992- Spinner a type of hubcap that spins independently inside of a wheel itself when a vehicle is in motion.
I hope that helps, Thank you:).
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