The history of the rest of the 20th century to the present focuses on the phenomenal growth of the city and its environmental and political consequences. In 1900, the population of Mexico City was about 500,000.[38] The city began to grow rapidly westward in the early part of the 20th century[27] and then began to grow upwards in the 1950s, with the Torre Latinoamericana becoming the city's first skyscraper.[20] The 1968 Olympic Games brought about the construction of large sporting facilities.[27] In 1969, the Metro system was inaugurated.[20] Explosive growth in the population of the city started from the 1960s, with the population overflowing the boundaries of the Federal District into the neighboring state of Mexico, especially to the north, northwest and northeast. Between 1960 and 1980 the city's population more than doubled to 8,831,079.[27] In 1980, half of all the industrial jobs in Mexico were located in Mexico City. Under relentless growth, the Mexico City government could barely keep up with services. Villagers from the countryside who continued to pour into the city to escape poverty only compounded the city's problems. With no housing available, they took over lands surrounding the city, creating huge shantytowns that extended for many miles.[31] This caused serious air and water pollution problems, as well as a sinking city due to overextraction of groundwater.[39] Air and water pollution has been contained and improved in several areas due to government programs, the renovation of vehicles and the modernization of public transportation.
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