The Golden Triangle where the fortune of an American entrepreneur and engineer who invented what was made?
Downtown Pittsburgh:  It is where the fortunes of such industrial barons as Andrew Carnegie, Henry Clay Frick, Henry J. Heinz, Andrew Mellon and George Westinghouse were made. George Westinghouse: George Westinghouse Jr. (October 6, 1846 – March 12, 1914) was an American entrepreneur and engineer who invented the railway air brake and was a pioneer of the electrical industry, gaining his first patent at the age of 19.
i don't know