Sixth Avenue is the southernmost of all numbered NYC avenues. For much of its history, it's been an avenue without a number. Although the Avenue's official name was changed to Avenue of the Americas in 1945 by Mayor Fiorello La Guardia, New Yorkers seldom use this term. Calling the avenue by that name has even become a shibboleth of sorts for something a tourist in the city might say. To avoid confusion among visitors, the street is signed as both Avenue of the Americas and Sixth Avenue.
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