Also in the category of boroughs hard to reach from Brooklyn without a car or undue delay: Staten Island. Today, three of its four bridges prohibit pedestrians and none have subway connections. One of those bridges (to NJ) used to have a pedestrian and cycle way, but a few years after the Streetcar Scandal it was removed as part of an expansion (!) orchestrated by Robert Moses. Look him up to find out more about the bizarre history of mass transit in mid-20th century NYC.
The history isn't that bizarre. Robert Moses simply despised anyone that wasn't rich, and spent his entire career trying to make the city even more miserable than it already was for the poor. If you're rich, you don't bike to Staten Island, plain and simple -- you drive a glorious automocar.
It's ironic because now all the rich people want to bury his highways underground.
> The history isn't that bizarre. Robert Moses simply despised anyone that wasn't rich, and spent his entire career trying to make the city even more miserable than it already was for the poor.
Robert Moses is a great example of the problems of unchecked power and hubris, even if ostensibly well-intentioned. But he absolutely democratized Long Island, which was an idyllic enclave of gigantic estates and private beaches before he built the LIE, Northern and Southern State Parkways, Jones Beach, etc.