世界で一番大きい港市国家は歴史上どこですか？
The Port of Houston is one of world's largest ports and serves the metropolitan area of Houston, Texas. The port is a 25-mile-long complex of diversified public and private facilities located a few hours' sailing time from the Gulf of Mexico. Located in the fourth-largest city in the United States, it is the busiest port in the U.S. in terms of foreign tonnage, second-busiest in the U.S. in terms of overall tonnage, and sixteenth-busiest in the world. Though originally the port's terminals were primarily within the Houston city limits, the port has expanded to such a degree that today it has facilities in multiple communities in the surrounding area. In particular the port's busiest terminal, the Barbours Cut Terminal, is located in Morgan's Point.
Port of Houston