When reading up on the United Nations on wikipedia, I noticed that Navy Island near Niagara falls was being considered at the time of the groups creation for it's location. I'm wondering what locations were considered outside of Manhattan, how seriously were they considered, and why was New York eventually chosen over them?
On 10 December 1945, the Congress of the United States unanimously resolved to invite the United Nations to establish its permanent home in that country. Thereafter, the decision to locate the United Nations near New York City was made by the General Assembly at its first session, held in London on 14 February 1946.
During the latter half of 1946, following selection of the United States as host country, a special United Nations site committee studied possible locations in such places as Philadelphia, Boston and San Francisco. While consideration was given at first to areas north of New York City, crowded Manhattan had not been seriously investigated. A last-minute offer of $8.5 million by John D. Rockefeller, Jr., for the purchase of the present site was accepted by a large majority of the General Assembly on 14 December 1946. New York City completed the site parcel by additional gifts of property.
The site chosen by the United Nations was a run-down area of slaughterhouses, light industry and a railroad barge landing.
Information taken from the United Nations Visitors Centre.