During the 1950s there were as many as 25,000 schools in the Congo.

During the early 1950s the board was divided on whether to defend communists persecuted under McCarthyism.

During the late 1950s it was sought by two rail historians, George Horn and Martin Schachne, but they did not gain access to the tunnel itself.

During the 1950s, the National Football League had grown to rival Major League Baseball as one of the most popular professional sports leagues in the United States.

During the 1950s, however, Graham began distancing himself from the older fundamentalism and, in preparation for his 1957 New York Crusade, he sought broad ecumenical sponsorship.

During his early journalism career, Marker became increasingly interested in filmmaking and experimented with photography in the early 1950s.

During the 1940s and 1950s, Casablanca was a major centre of anti-French rioting.

During the late 1950s and early 1960s Brubeck canceled several concerts because the club owners or hall managers continued to resist the idea of an integrated band on their stages.

During the 1950s, Kaye visited Australia, where he played " Buttons " in a production of Cinderella in Sydney.

During World War II and through the 1950s, high frequency (" short wave ") radio was widely used for military and diplomatic communication, and could be intercepted at great distances.

During the 1950s and 1960s, Peter van de Kamp of Swarthmore College made another prominent series of detection claims, this time for planets orbiting Barnard's Star.

During the 1950s, 1960s and 1970s, several events occurred which raised the public awareness of harm to the environment caused by man.

During the 1950s and 1960s, the electric guitar became the most important instrument in pop music.

During Japanese cinema's ' Golden Age ' of the 1950s, successful films included Rashomon ( 1950 ), Seven Samurai ( 1954 ) and The Hidden Fortress ( 1958 ) by Akira Kurosawa, as well as Yasujirō Ozu's Tokyo Story ( 1953 ) and Ishirō Honda's Godzilla ( 1954 ).

During Indian cinema's ' Golden Age ' of the 1950s, it was producing 200 films annually, while Indian independent films gained greater recognition through international film festivals.

During the 1950s and 60s, Afghanistan was able to use the Russian and American need for allies during the Cold War as a way to receive economic assistance from both countries.

During his career as a director, he retained an early ambition to teach science, and after his career declined in the 1950s he made some educational TV films related to science subjects.

During World War II, the urgent need for cheap, available food preservatives led to it being used again, but it was finally banned in the 1950s.

During the 1950s, when the independence of Ghana was in sight, demands grew for a separate Ewe state, an idea that Kwame Nkrumah, leader of the Gold Coast independence movement, opposed.

During the early 1950s, Groucho described his perfect woman: “ Someone who looks like Marilyn Monroe and talks like George S. Kaufman .”

During the late 1950s, high-stakes games such as Twenty One and The $ 64, 000 Question began a rapid rise in popularity.

During the 1950s — as a result of these improvements and the strong international export prices — beef, cotton, and coffee became significant export products for the first time.

During the later 1950s, Great Britain emerged as a producer of horror films.

During the 1950s, Holden dominated the Australian car market.

During the 1950s and 1960s the skyline of London altered dramatically as tower blocks were erected, although these later proved unpopular.

During the next five years liberal leaders in the United States sank in the cumulative confusion attendant upon and manifested in a negative policy of Containment -- and the bitterest irony -- enforced and enforceable only by threat of a weapon that we felt the greatest distaste for but could not abandon: the atom bomb.

During World War 2,, he was a lieutenant commander in the United States Navy.

During the trip Selkirk decided that the route through Illinois territory to Indiana and the eastern United States was the best route for goods from England to reach Red River and that the United States was a better source of supply for many goods than either Canada or England.

During his short reign, peace was established both at home and abroad, finances were well regulated, and the various administrative services were placed on a basis that afterwards enabled Spain to pass through the disastrous war with the United States without the threat of a revolution.

During World War II, Abadan was a major logistics center for Lend-Lease aircraft being sent to the Soviet Union by the United States.

During the Vietnam War, between 1962 and 1971, the United States military sprayed nearly of material containing chemical herbicides and defoliants mixed with jet fuel in Vietnam, eastern Laos and parts of Cambodia, as part of Operation Ranch Hand.

During the Vietnam War, between 1962 and 1971, the United States military sprayed nearly of chemical herbicides and defoliants in Vietnam, eastern Laos and parts of Cambodia, as part of the aerial defoliation program known as Operation Ranch Hand.

During the Western Allied invasion of Germany in April 1945, the airfield was seized by the United States Third Army, and used by the USAAF 354th Fighter Group which flew P-47 Thunderbolts from the aerodrome ( designated ALG R-82 ) from late April until the German capitulation on 7 May 1945.

During the 2008 United States presidential election, she branded the Republican Party vice-presidential candidate Sarah Palin as " stupid " and a " disgrace to women ".

During the Civil war, soldiers from different parts of the United States played baseball together, leading to a more unified national version of the sport.

During the Second World War, Bletchley Park was the site of the United Kingdom's main decryption establishment, the Government Code and Cypher School ( GC & CS ), where ciphers and codes of several Axis countries were decrypted, most importantly the ciphers generated by the German Enigma and Lorenz machines.

During the early 1970s, Manchester United were no longer competing among the top teams in England, and at several stages were battling against relegation.

During the first Gulf War the United Nations activated a biological and chemical response team, Task Force Scorpio, to respond to any potential use of weapons of mass destruction on civilians.

During the days of the Cold War in the United Kingdom, labour union leaders and other leftists were sometimes derisively described as " Bolshies ".

During the drafting of the Indian Constitution, laws from Ireland, the United States, Britain, and France were all synthesized to get a refined set of Indian laws, as it currently stands.

During the presidencies of Prieto and his two successors, Chile modernized through the construction of ports, railroads, and telegraph lines, some built by United States entrepreneur William Wheelwright.

During the early 20th century, comic strips were widely associated with publisher William Randolph Hearst, whose papers had the largest circulation of strips in the United States.

During that same period, the economy grew by 3 % a year, and by 1951 the United Kingdom had " the best economic performance in Europe, while output per person was increasing faster than in the United States.

During the Cold War period both the United States and the Soviet Union experimented further with the concept, deploying early cruise missiles from land, submarines and aircraft.

During and after World War II, Chiang and his American-educated wife Soong May-ling, known in the United States as " Madame Chiang ", held the support of the United States ' China Lobby, which saw in them the hope of a Christian and democratic China.

During the American Civil War, some Maritimers emigrated to the United States to volunteer for the armies of the Union or the Confederacy.