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 First Indochina War, Lê was active in a communist cadre in the South.

During the First Indochina War Lê served as the Secretary of the Regional Committee of South Vietnam.

During the orchestrated chaos of the first coup, the disguised loyalists would riot and in the ensuing mayhem, kill the leading coup plotters, such as Generals Dương Văn Minh, Trần Văn Đôn, Lê Văn Kim and junior officers assisting them.

During the 1930s, the Vietnamese Communist Party was nearly wiped out under French suppression with the execution of top leaders such as Phú, Lê Hồng Phong, and Nguyễn Văn Cừ.

" During 1967 things had become so bad on the battlefield that Lê Duẩn ordered Thanh to incorporate aspects of protracted guerrilla warfare into his strategy.

During the same period, a counterattack was launched by a new, third grouping ( the centrists ) led by President Hồ Chí Minh, Lê Ðức Thọ, and Foreign Minister Nguyễn Duy Trinh, who called for negotiations.

During this period, there existed a Northern Dynasty, established by Mạc Đăng Dung in Đông Đô, and a Southern Dynasty, established by Nguyễn Kim under the name of Lê emperors in Tây Đô.

During the Trần Dynasty, there were three kinds of rice field: ruộng quốc khố ( national budget rice field ) with 3 levels, ruộng thác điền with 3 levels ( the name derives from a story about Lê Phụng Hiểu.

During the 18th century, Vietnam was under the nominal rule of the officially-revered, but politically-ignored Lê Dynasty.

During his presidency, the company's physical plant was enormously expanded, and the length and breadth of the Brown & Sharpe machine tool line became the greatest in the world.

During the summer of 1960, it became the setting for a bitter and basic labor-management struggle.

During the excitement following Lindbergh's flight to Paris earlier in 1927, dare devil aviators overnight became legendary heroes.

During the morning hours, it became clear that the arrest of Spencer was having no sobering effect upon the men of the Somers.

During this period winter sports were slowly introduced: in 1882 the first figure skating championship was held in St. Moritz, and downhill skiing became a trendy sport with English visitors early in the 20th century, as the first ski-lift was installed in 1908 above Grindelwald.

During the post-World War I period ski-lifts were built in Swiss and Austrian towns to accommodate winter visitors, but summer tourism continued to be important ; by the mid-20th century the popularity of downhill skiing increased greatly as it became more accessible and in the 1970s several new villages were built in France devoted almost exclusively to skiing, such a Les Menuires.

During its preparation he became a friend of Cosima Wagner ( then in Strasbourg ), with whom he had many theological and musical conversations, exploring his view of Bach's descriptive music, and playing the major Chorale Preludes for her at the Temple Neuf.

During the Tokugawa period ( 1600 – 1868 ) the Ainu became increasingly involved in trade with Japanese who controlled the southern portion of the island that is now called Hokkaido.

During the Akkadian period, the Akkadian language became the lingua franca of the Middle East, and was officially used for administration, although the Sumerian language remained as a spoken and literary language.

During his brother's reign, he participated in the taking of Huesca ( the Battle of Alcoraz, 1096 ), which became the largest city in the kingdom and the new capital.

During his reign, Jerusalem became more closely allied with the Byzantine Empire, and the two states launched an unsuccessful invasion of Egypt.

During that time, while studying at Kabul University, Massoud became involved with the Sazman-i Jawanan-i Musulman (" Organization of Muslim Youth "), the student branch of the Jamiat-i Islami (" Islamic Society "), whose chairman then was professor Burhanuddin Rabbani.

During this period the Muslim world became an intellectual centre for science, philosophy, medicine and education as the Abbasids championed the cause of knowledge and established the " House of Wisdom " ( Arabic: بيت الحكمة ) in Baghdad.

During the 19th century, the fields of science and art became increasingly intertwined as scientists such as Michael Faraday began to study the damaging effects of the environment to works of art.

During the latter half of the 19th century, considerable public improvements were made to the town, which became, despite its neighbouring collieries, a pleasant place to live.

During the 1980s and 1990s, she became one of the first CCM artists to cross over into mainstream pop on the heels of her successful albums Unguarded and Heart in Motion, the latter of which included the No. 1 single " Baby Baby ".

During this time, the annals became an increasingly well-known and respected journal.

During the Weimar era, Berlin became internationally renowned as a center of cultural transformation, at the heart of the Roaring Twenties.

During the deposition for the Jones lawsuit, which was held at the White House, Clinton denied having sexual relations with Monica Lewinsky a denial that became the basis for the impeachment charge of perjury.

During the mid-1980s, many sysops opted for the less expensive, ubiquitous Commodore 64 ( introduced in 1982 ), which became popular among software pirate groups.

During World War I, the large navy was cut off from resupply of big gun shells and became a paper navy, thus reinforcing the drive for self-sufficiency.

During this contest he met vocalist Anni-Frid Lyngstad, and they soon became a couple.

During the late 1960s, the Baseball Players Union became much stronger and conflicts between owners and the players ' union led to major work stoppages in 1972, 1981, and 1994.

During the analysis of the bubbles it became apparent that the products contain chemicals which could be seen as undesired in food.

During the period of the English Civil War, the role of bishops as wielders of political power and as upholders of the established church became a matter of heated political controversy.