这么大的工程，没有政府的背书，光靠私人资本很难成事。 见第三点。

https://www.brooklynpaper.com/five-things-you-may-not-know-about-the-brooklyn-bridge/#:~:text=The%20bridge%20began%20as%20a,%242.5%20billion%20in%20today's%20money.