Terminal vs. Port vs. Berth
According to the P&O Website, P&O operates 1 terminal in New York City with 7 berths. According to the NY Port Authority website, this terminal is for cruise ships only. The terminal is one among a dozen other terminals in NY.
P&O operates roughy 10 terminals at 6 U.S. ports. Compare this to the 3000 terminals and 350+ ports in the United States.
UPDATE: Air Marshall directs us to this article which points out why Congress is not in charge of Security.