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In page Panama Canal:

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In 1904, the United States purchased the French equipment and excavations, including the Panama Railroad, for US$40 million, of which $30 million related to excavations completed, primarily in the Culebra Cut, valued at about $1.00 per cubic yard ($1.3/m3).[16] The United States also paid the new country of Panama $10 million and a $250,000 payment each following year.[citation needed]