Cut and pasted from Wikipedia (ie no guarantee as to the veracity of what it says):
Pittsburgh was officially named with its present spelling on April 22, 1794, by an act of the Pennsylvania Department, stating, "Be it enacted by the Senate and House of Representatives of the Commonwealth of Pennsylvania, in General Assembly met, and it is hereby enacted by the authority of the same, that the said town of Pittsburgh shall be, and the same is hereby, erected into a borough, which shall be called the borough of Pittsburgh for ever."[27]
Pittsburgh is one of the few American cities to be spelled with an h at the end of a burg suffix. This style is commonly used for many other cities and towns of Western Pennsylvania.[28] While briefly named "Pittsburg" from 1890 to 1911 following a declaration by the United States Board on Geographic Names, the Pittsburgh spelling was officially restored after a public campaign by the citizens of the city.[27] The city continued to be referred to as Pittsburg (without the H), however, until 1921, when in August the Pittsburg Press changed its name to add the letter "H" and began referring to the city and its sports teams using that longer name as well.
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