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 these visits the dentist will adjust the braces to increase the pressure on her teeth.

During the 1980s, CHOGMs were dominated by calls for the Commonwealth to impose sanctions on South Africa to pressure the country to end apartheid.

During a visit to England he complained of dizziness and had to have his blood pressure checked on August 29, 1959 ; however, before dinner at Chequers on the next day his doctor General Howard Snyder recalled Eisenhower " drank several gin and tonics, and one or two gins on the rocks ... three or four wines with the dinner ".

During World War I, Afghanistan remained neutral despite pressure to support Turkey when its sultan proclaimed his nation's participation in what it considered a holy war.

During the war theater of 1965 indo-Pakistan war, the East-Pakistan government remained silenced and did not send any reinforcement troops to press any pressure on Eastern India.

During the first five years of Humayun's reign, these two rulers were quietly extending their rule, although Sultan Bahadur faced pressure in the east from sporadic conflicts with the Portuguese.

During the compression process, pressure, temperature and the density of the fuel mixture increases.

During the 19th century, after Schleswig-Holstein had come under the government of Prussia ( from 1871 the German Empire ) following the Second Schleswig War in 1864, a combination of naval interests — the German navy wanted to link its bases in the Baltic and the North Sea without the need to sail around Denmark — and commercial pressure encouraged the development of a new canal.

During the acute withdrawal period systolic and diastolic blood pressure increase, usually beyond pre-morphine levels, and heart rate increases, which have potential to cause a heart attack, blood clot, or stroke.

During the revolution Lenin advocated militancy and violence of workers as a means to pressure the middle class to join and overthrow the Tsar.

During glottal closure, the air flow is cut off until breath pressure pushes the folds apart and the flow starts up again, causing the cycles to repeat.

During the week leading to Super Bowl XXVI, it seemed most of the pressure was on the Bills.

During the 19th and early 20th centuries, it gradually became apparent that many common examples of forces – contact forces, elasticity, viscosity, friction, and pressure – result from electrical interactions between the smallest particles of matter.

During most of this unsuccessful period, Marshall continually refused to integrate the team, despite pressure from The Washington Post and the federal government of the United States.

During the seventeen seconds that the fire raged, fed by pure oxygen at slightly greater than atmospheric pressure, Chaffee stayed strapped to his right-hand seat, as it was his job to maintain communications in an emergency, while White in the center seat apparently tried in vain to open the hatch.

During its second reading, Powell warned of passing legislation " in haste and under the immediate pressure of indignation on matters which touch the fundamental liberties of the subject ; for both haste and anger are ill counsellors, especially when one is legislating for the rights of the subject ".

During World War II, the two sisters stayed at Windsor Castle, despite government pressure to evacuate to Canada.

During bubble collapse, the inertia of the surrounding water causes high pressure and high temperature, reaching around 10, 000 kelvins in the interior of the bubble, causing the ionization of a small fraction of the noble gas present.

During that year, diplomatic pressure from France and Rome persuaded Edward to release the imprisoned King John into the custody of the pope, and Wallace was sent to France to seek the aid of Philip IV ; he possibly also travelled to Rome.

During the late 1990s, a large supply of low-cost materials caused a sudden surge in supply of heat-treated rubies, leading to a downward pressure on ruby prices.

During the crisis concerning the Exclusion Bill in 1680, Charles at first invited William to come to England to bolster the king's position against the exclusionists, then withdrew his invitation — after which Lord Sunderland also tried unsuccessfully to bring William over but now to put pressure on Charles.

During the inter-war years, Plaid Genedlaethol Cymru was most successful as a social and educational pressure group rather than as a political party.

During promotional appearances for this album it became clear that Matthews was not coping well with the increased pressure, suffering from anxiety and nervous exhaustion which resulted in the cancellation of several tour dates and a deterioration in the relationships between the band members.

During mid-winter, strong areas of high pressure often situate themselves over the Great Basin, leading to strong temperature inversions.