We can go to war in Iraq and Afghanistan, and threaten to blow Iran off the face of the planet. We can conduct a nonstop campaign of drone and helicopter attacks in Pakistan and run a network of secret prisons around the world. We are the mightiest nation mankind has ever seen.

But we can’t seem to build a railroad tunnel to carry commuters between New Jersey and New York.

The United States is not just losing its capacity to do great things. It’s losing its soul. It’s speeding down an increasingly rubble-strewn path to a region where being second rate is good enough.

The railroad tunnel was the kind of infrastructure project that used to get done in the United States almost as a matter of routine. It was a big and expensive project, but the payoff would have been huge. It would have reduced congestion and pollution in the New York-New Jersey corridor. It would have generated economic activity and put thousands of people to work. It would have enabled twice as many passengers to ride the trains on that heavily traveled route between the two states.

The project had been in the works for 20 years, and ground had already been broken when the governor of New Jersey, Chris Christie, rejected the project on Thursday, saying that his state could not afford its share of the costs. Extreme pressure is being exerted from federal officials and others to get Mr. Christie to change his mind, but, as of now, the project is a no-go.