Is the book Brooklyn bridge historical fiction?

It's tricky to definitively say whether "Brooklyn Bridge" is historical fiction without knowing which specific book you're referring to. There are multiple books with that title, including:

* "The Brooklyn Bridge: A History" by David McCullough: This is a non-fiction book that tells the true story of the construction of the Brooklyn Bridge.

* "Brooklyn Bridge" by Colm Tóibín: This is a novel that tells the story of a young Irish woman who emigrates to America in the 1950s. The Brooklyn Bridge is a backdrop to her experiences, but the book is not explicitly about the bridge's construction.

So, depending on which book you're referring to, it could be either non-fiction or historical fiction.

To get a more accurate answer, please tell me the author of the book you're interested in.