bringing bonanza reflected by exports increase, higher foreign investment and development infrastructure; roads were built, industry increased, public expense grew and urban economy expanded. The liberal republic Following banana zone killing and conservative party division, Enrique Olaya Herrera took office in 1930. The liberal party reformed, during 16 years of the so-called Liberal Republic, agricultural, social, political, labor, educational, economic and administrative sectors. Unionism strengthened and education coverage expanded. In 1938 the fourth centenary of Bogotá foundation which population had reached 333,312 inhabitants was celebrated. The celebration produced a large number of infrastructure works, new construction and work sources. Following 1946 liberal party division, a conservative candidate took presidential office again in 1948, after liberal leader Jorge Eliécer Gaitán killing, Bogotá downtown was practically destroyed and violence increased. From that date, basically city, urban, architectural and population sectors substantially changed. City life in the 20th century During those years Bogotá cultural life transformation accelerated, partially thanks to new communication media. Newspapers, domestic and foreign magazines, cinema, radio telegraph and telephone communications multiplied and aerial transportation linked Bogotá to the rest of the world. Waves of peasants and farmers fleeing violence and those coming to Bogotá in search for work and better opportunities tripled the population, which went from 700,000 in 1951 to 1,600,000 in 1964 and 2,500,000 inhabitants in 1973. The city modernized, expanded work fields and industry, finances, construction economic offer and education. During General Rojas Pinilla (1953 to 1957) dictatorship, television arrived in Colombia and works such as El Dorado airport replacing ancient Techo airport were completed dynamizing along the Avenue joining the airport to the city, urban development and a large variety of western neighborhoods development. North Highway in turn expanded development to the north. Official Administrative Center project began and was subsequently completed to form the National Administrative Center.- CAN. Bogotá, Special District and Capital District In 1954 municipalities of Usme, Bosa, Fontibón, Engativá, Suba and Usaquén were annexed by Bogotá and the Special District of Bogotá was created projected towards future growth, and the new city administration was organized. In 1991, under a new Constitution, Bogotá became Capital District. According to a census held in 1985, the population of the capital had increased to 4,100,000 and by 1993 population reached nearly 6,000.000. Economic transformation City economy has greatly developed and diversified. Industrial production became substantial, requiring specialized industrial areas development. Artisan production became one of