1950
September 26th Operation Sea Spray started in San Francisco, CA

In 1950, in order to conduct a simulation of a biological warfare attack, the U.S. Navy sprayed large quantities of the bacteria Serratia marcescens – considered harmless at the time – over the city of San Francisco during a project called Operation Sea-Spray. Numerous citizens contracted pneumonia-like illnesses, and at least one person died as a result.

 
1950
Dr. Joseph Stokes of the University of Pennsylvania deliberately infected 200 female prisoners with viral hepatitis.
1951
February 27th The 22nd Amendment was ratified

Twenty-second Amendment, amendment (1951) to the Constitution of the United States effectively limiting to two the number of terms a president of the United States may serve. It was one of 273 recommendations to the U.S. Congress by the Hoover Commission, created by Pres. Harry S. Truman, to reorganize and reform the federal government. It was formally proposed by the U.S. Congress on March 24, 1947, and was ratified on Feb. 27, 1951.

 
1952
King George VI of England died

The King failed to recover from a lung operation, and died in his sleep on 6 February 1952 at Sandringham; he was aged 56. After lying in state at Westminster Hall, the King’s funeral was held at St George’s Chapel, Windsor, where he lies buried.

 
 
1952
March 10th Fulgencio Batista became dictator of Cuba

Batista was a Cuban military officer and politician who served as the elected President of Cuba from 1940 to 1944 and as its U.S.-backed dictator from 1952 to 1959, before being overthrown during the Cuban Revolution. Batista initially rose to power as part of the 1933 Revolt of the Sergeants, which overthrew the provisional government of Carlos Manuel de Céspedes y Quesada. He then appointed himself chief of the armed forces, with the rank of colonel and effectively controlled the five-member “pentarchy” that functioned as the collective head of state. He maintained this control through a string of puppet presidents until 1940, when he was himself elected President of Cuba on a populist platform. He then instated the 1940 Constitution of Cuba  and served until 1944. After finishing his term, Batista moved to Florida, returning to Cuba to run for president in 1952. Facing certain electoral defeat, he led a military coup against President Carlos Prío Socarrás that pre-empted the election.

Back in power and receiving financial, military and logistical support from the United States government, Batista suspended the 1940 Constitution and revoked most political liberties, including the right to strike. He then aligned with the wealthiest landowners who owned the largest sugar plantations, and presided over a stagnating economy that widened the gap between rich and poor Cubans. Eventually it reached the point where most of the sugar industry was in U.S. hands, and foreigners owned 70% of the arable land. As such, Batista’s repressive government then began to systematically profit from the exploitation of Cuba’s commercial interests, by negotiating lucrative relationships with both the American Mafia, who controlled the drug, gambling, and prostitution businesses in Havana, and with large U.S.-based multinational companies who were awarded lucrative contracts. To quell the growing discontent amongst the populace—which was subsequently displayed through frequent student riots and demonstrations—Batista established tighter censorship of the media, while also utilizing his Bureau for the Repression of Communist Activities secret police to carry out wide-scale violence, torture and public executions. These murders mounted in 1957, as socialist ideas became more influential. Many people were killed, with estimates ranging from hundreds to about 20,000 people killed.

 
 
1952
The McCarran-Walter Act

The McCarran-Walter Act formally ends the exclusion of Asian immigrants to the United States.

1953
Dwight Eisenhower becomes 34th president of usa
1953
Elizabeth II became queen of England

Queen Elizabeth II was crowned on 2 June, 1953 in Westminster Abbey.

1953
July 26th The Cuban Revolution began

The Cuban Revolution was an armed revolt conducted by Fidel Castro’s revolutionary 26th of July Movement and its allies against the military dictatorship of Cuban President Fulgencio Batista.

 
1954
The first colored television

 

 
1954
The words “under God” were added to the Pledge of Allegiance on Flag Day

 

 
1954
The Mackinac Bridge opened
The Mackinac Bridge is a suspension bridge spanning the Straits of Mackinac to connect the Upper and Lower Peninsulae of the U.S. state of Michigan. Opened in 1957, the 26,372-foot-long bridge is the world’s 24th-longest main span and the longest suspension bridge between anchorages in the Western Hemisphere.
1954
November 11th Armistice Day was changed to Veteran's Day
1955
The first successful polio vaccine was created

The first effective polio vaccine was developed in 1952 by Jonas Salk and a team at the University of Pittsburgh that included Julius Youngner, Byron Bennett, L. James Lewis, and Lorraine Friedman, which required years of subsequent testing.

 
1955
November 1st Vietnam War began
1956
The USA Interstate System was created

The Interstate System was created when the Federal-Aid Highway Act was signed by President Dwight D. Eisenhower on June 29, 1956. Kansas opened the first section of Interstate in the nation on I-70 just west of Topeka on November 14, 1956.

 
1956
The Crescent nail-tail wallaby went extinct
1958
The Seat Belt was invented
1958
Visa Inc. was founded
1958
The largest Tsunami ever recorded

The largest tsunami wave ever recorded broke on a cool July night in 1958 and only claimed five lives. A 1,720 foot tsunami towered over Lituya Bay, a quiet fjord in Alaska, after an earthquake rumbled 13 miles away

 
1958
December 31st Fulgencio Batista resigned as leader of Cuba

On December 31, 1958, at a New Year’s Eve party, Batista told his cabinet and top officials that he was leaving the country. After seven years, Batista knew his presidency was over, and he fled the island in the early morning.

 
1959
January 1st Fidel Castro began to control Cuba

After Batista’s overthrow in 1959, Castro assumed military and political power as Cuba’s Prime Minister. The United States came to oppose Castro’s government and unsuccessfully attempted to remove him by assassination, economic blockade, and counter-revolution, including the Bay of Pigs Invasion of 1961.

 
1959
Jan 3rd Alaska became 49th state
1959
August 21th Hawaii became 50th state
1959
The planet reaches 3 billion people population
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