The negotiations concluded after an all-night session with the signing of the treaty at 04:00 on March 30, 1867,[13] with the purchase price set at $7.2 million ($122 million today[1]), or about 2 cents per acre ($4.74/km2).[14]
https://en.m.wikipedia.org/wiki/Alaska_Purchase
U.S. Might Have More Oil Resources Than Saudi Arabia, But… http://www.forbes.com/sites/energysource/2012/03/29/u-s-might-have-more-oil-resources-than-saudi-arabia-but/#337397ab2737
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