people, mostly descendants of slaves, then moved to live in the city's hills, creating the first favelas. Inspired by the city of Paris, Passos built the Municipal Theatre, the National Museum of Fine Arts and the National Library in the city's center; brought electric power to Rio and created larger avenues to adapt the city to automobiles. Passos also named Dr. Oswaldo Cruz as Director General of Public Health. Cruz's plans to clean the city of diseases included compulsory vaccination of the entire population and forced entry into houses to kill mosquitos and rats. The people of the city rebelled against Cruz's policy, in what would be known as the Vaccine Revolt. In 1910, Rio saw the Revolt of the Lash, where Afro-Brazilian crew members in the Brazilian Navy mutinied against the heavy use of corporal punishment, which was similar to the punishment slaves received. The mutineers took control of the battleship Minas Geraes and threatened to fire on the city. Another military revolt occurred in 1922, the 18 of the Copacabana Fort revolt, a march against the Old Republic's coronelism and café com leite politics. This revolt marked the beginning of Tenentism, a movement that resulted in the Brazilian Revolution of 1930 that started the Vargas Era. Until the early years of the 20th century, the city was largely limited to the neighborhood now known as the historic city center (see below), on the mouth of Guanabara Bay. The city's center of gravity began to shift south and west to the so-called Zona Sul (South Zone) in the early part of the 20th century, when the first tunnel was built under the mountains between Botafogo and the neighborhood that is now known as Copacabana. Expansion of the city to the north and south was facilitated by the consolidation and electrification of Rio's streetcar transit system after 1905. Botafogo's natural environment, combined with the fame of the Copacabana Palace Hotel, the luxury hotel of the Americas in the 1930s, helped Rio to gain the reputation it still holds today as a beach party town. This reputation has been somewhat tarnished in recent years by favela violence resulting from the narcotics trade and militias. Plans for moving the nation's capital city from Rio de Janeiro to the center of Brazil had been occasionally discussed, and when Juscelino Kubitschek was elected president in 1955, it was partially on the strength of promises