New York City, in 1776, lay at the end of Manhattan Island, in shape somewhat like an arrowhead, with its point turned towards the sea and its barbs extended at uneven lengths along the East and Hudson rivers. It occupied no more space than is now included within the five lower and smallest of its twenty-four wards. Excepting a limited district laid out on the east side, in part as far as Grand street, the entire town stood below the line of the present Chambers street, and covered an area less than one mile square. Then, as now, Broadway was its principal thoroughfare. Shaded with rows of trees, and lined mainly with residences, churches, and public-houses, it stretched something more than a mile to the grounds of the old City Hospital, near Duane street. Its starting-point was the Battery at the end of the island, but not the Battery of to-day; for, under the system of "harbor encroachments," the latter has more than trebled in size, and is changed both in its shape and its uses. The city defenses at that time occupied the site. Here at the foot of Broadway old Fort George had been erected upon the base of the older Fort Amsterdam, to guard the entrance to the rivers, and with its outworks was the only protection against an attack by sea. It was a square bastioned affair, with walls of stone, each face eighty feet in length, and within it stood magazines, barracks, and, until destroyed by fire, the mansion of the colonial governors. For additional security, about the time of the French war, an extensive stone battery, with merlons of cedar joists, had been built just below the fort along the water's edge, enclosing the point from river to river, and pierced for ninety-one pieces of cannon.
We can infer that the larger work from which this passage was taken is most likely about:
A.The geography of New York City
B.The battles and fortifications in New York City
C.Seventeenth century New York
D.Changes on Manhattan Island
E.The old City Hospital
According to the author, what part of New York has stayed the same?