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Period: to
Carlee's Chapter 27 timeline
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Harry Truman becomes the first president to address the nation on TV from the White House.
On this day in 1947, President Harry S. Truman delivered the first televised presidential address from the White House — to a limited audience. Television was still in its infancy: There were only about 44,000 TV sets in U.S. homes, concentrated in a few cities, compared with some 40 million radios. -
Transistor is invented, spurring growth in computers and electronics.
Another computer development spurred by the war was the Electronic ... By 1948, the invention of the transistor greatly changed the computer's development. -
President Eisenhower and Congress add the words “Under God” to the Pledge of Allegiance.
One Nation Under God" redirects here. For the album, see One Nation Under God (album). For the film, see One Nation Under God (film).
Official versions (changes in bold italics)
1892
"I pledge allegiance to my flag and the republic for which it stands: one nation indivisible with liberty and justice for all."
1892 to 1923
"I pledge allegiance to my flag and to the republic for which it stands: one nation indivisible with liberty and justice for all."
1923 to 1924 -
Polio vaccine announced to the world by Dr. Jonas Salk and Dr. Thomas Francis.
Until 1955, when the Salk vaccine was introduced, polio was considered the most frightening public health problem of the post-war United States. Annual epidemics were increasingly devastating. The 1952 epidemic was the worst outbreak in the nation's history. Of nearly 58,000 cases reported that year, 3,145 people died and 21,269 were left with mild to disabling paralysis, with most of the victims children. The "public reaction was to a plague", said historian William O'Neill. "Citizens of urb -
• The first nuclear power plant in the U.S. goes online at Shippingport, Pa.
The light-water breeder reactor at Shippingport, Pennsylvania — the first in the United States — goes to full power on the anniversary of Chicago Pile-1. An experimental breeder reactor devised by Chicago Pile-1 veteran Walter Zinn had created the first nuclear-generated electricity in 1951. President Dwight D. Eisenhower broke ground for the first commercial plant, to be operated by Pittsburgh's Duquesne Light Company, in 1954. -
NASA is established.
The National Aeronautics and Space Administration (NASA) is the agency of the United States government that is responsible for the nation's civilian space program and for aeronautics and aerospace research. Since February 2006, NASA's mission statement has been to "pioneer the future in space exploration, scientific discovery and aeronautics research."
