Here's a short story:

Buenos Aires ( or ; ) is the capital and most populous city of Argentina. The city is located on the western shore of the estuary of the Río de la Plata, on the South American continent's southeastern coast. "Buenos aires" can be translated as "fair winds" or "good airs", but the first one was the meaning intended by the founders in the 16th century, by the use of the original name "Real de Nuestra Señora Santa María del Buen Ayre". The Greater Buenos Aires conurbation, which also includes several Buenos Aires Province districts, constitutes the fourth-most populous metropolitan area in the Americas, with a population of around 17 million. 

The city of Buenos Aires is neither part of Buenos Aires Province nor the Province's capital; rather, it is an autonomous district. In 1880, after decades of political infighting, Buenos Aires was federalized and removed from Buenos Aires Province. The city limits were enlarged to include the towns of Belgrano and Flores; both are now neighborhoods of the city. The 1994 constitutional amendment granted the city autonomy, hence its formal name: Ciudad Autónoma de Buenos Aires (Autonomous City of Buenos Aires). Its citizens first elected a chief of government (i.e. mayor) in 1996; previously, the mayor was directly appointed by the President of the Republic. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What river is Buenos Aires near?
Guess: the Río de la Plata

Question: What part of the river is it by?
Guess: on the western shore of

Question: True or False: Three American cities are bigger than Buenos Aires.
Guess: unknown

Question: How populous is its metro area?
Guess: around 17 million people

Question: Is the city part of a province?
Guess: No

Question: Was it ever?
Guess: Yes

Question: When did that end?
Guess: In 1880

Question: Was that a quick and easy choice?
Guess: No

Question: True or False: The city grew in size after 1880.
Guess: True

Question: What is own town that joined the city?
Guess: Belgrano

Question: And another?
Guess: Flores

Question: Are they still towns?
Guess: No

Question: What are they?
Guess: neighborhoods

Now answer the following question in the same format.

Question: What was the city's original name?

Ciudad Autónoma de Buenos Aires