Quote:
откуда дата?
Оттуда же, из вики -
http://en.wikipedia.org/wiki/1802July 4 – At West Point, New York the United States Military Academy opens.
http://www.spartacus.schoolnet.co.uk/USAwestpoint.htmIn March, 1802, Congress passed an act establishing the United states Military Academy at West Point, New York. The academy opened on 4th July, 1802, and for the first ten years was mainly an apprentice school for military engineers.
То есть в марте -указ Конгресса, 4 июля в академию вошли первые курсанты.