Conversation so far:
Where are the andrew carnegie libraries?
Andrew Carnegie established public libraries throughout the United States, Britain, Canada and other English-speaking countries.
What led andrew Carnegie to do the philantropist work of building libraries?
Andrew Carnegie was inspired by meetings with philanthropist Enoch Pratt
What happened with the andrew carnegie libraries?
Andrew Carnegie turned over management of the library project by 1908 to his staff, led by James Bertram

Question: When did his library open?
Self-contained rewrite: When did Andrew Carnegie's library open?