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The city grew as the population did, coming up against the lake's waters. As the depth of the lake water fluctuated, Mexico City was subject to periodic flooding. A major labor draft, the desague, compelled thousands of Indians over the colonial period to work on infrastructure to prevent flooding. Floods were not only an inconvenience but also a health hazard, since during flood periods human waste polluted the city's streets. By draining the area, the mosquito population dropped as did the frequency of the diseases they spread. However, draining the wetlands also changed the habitat for fish and birds and the areas accessible for Indian cultivation close to the capital.
How many Indians helped build the infrastructure?
A: thousands

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A Spanish expedition was sent from Buenos Aires, organized by the Spanish governor of that city, Bruno Mauricio de Zabala. On 22 January 1724, the Spanish forced the Portuguese to abandon the location and started populating the city, initially with six families moving in from Buenos Aires and soon thereafter by families arriving from the Canary Islands who were called by the locals "guanches", "guanchos" or "canarios". There was also one significant early Italian resident by the name of Jorge Burgues.
Who was one significant early italian resident?
A: Jorge Burgues

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He was known affectionately as "Good Pope John". His cause for canonization was opened under Pope Paul VI during the final session of the Second Vatican Council on 18 November 1965, along with the cause of Pope Pius XII. On 3 September 2000, John XXIII was declared "Blessed" alongside Pope Pius IX by Pope John Paul II, the penultimate step on the road to sainthood after a miracle of curing an ill woman was discovered. He was the first pope since Pope Pius X to receive this honour. Following his beatification, his body was moved from its original burial place in the grottoes below the Vatican to the altar of St. Jerome and displayed for the veneration of the faithful.[citation needed]
Who was the last pope before John XXIII to receive the title?
A: Pope Pius X

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During the 19th century, Britain and the Russian Empire vied to fill the power vacuums that had been left by the declining Ottoman Empire, Qajar dynasty and Qing Dynasty. This rivalry in Eurasia came to be known as the "Great Game". As far as Britain was concerned, defeats inflicted by Russia on Persia and Turkey demonstrated its imperial ambitions and capabilities and stoked fears in Britain of an overland invasion of India. In 1839, Britain moved to pre-empt this by invading Afghanistan, but the First Anglo-Afghan War was a disaster for Britain.
What was the British-Russian rivalry called?
A:
the "Great Game"