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The Mallarino-Bidlack Treaty was a treaty signed between New Granada (today Colombia) and the United States, on December 12, 1846. Officially, it was entitled Tratado de Paz, Amistad, Navegación y Comercio (Treaty of Peace, Friendship, Navegation and Trade), and was meant to represent an agreement of mutual cooperation. It granted the U.S. significant transit rights over the Panamanian isthmus, as well as military powers to suppress social conflicts and independence struggles targeted against Colombia. Under the Bidlack-Mallarino Treaty, the U.S. intervened militarily many times on the isthmus, usually against civilians, peasant guerrillas, or Liberal Party independence struggles. After the beginning of the California Gold Rush of 1848, the U.S. spent seven years constructing a trans-isthmian Panama Railway. The end result of the treaty, however, was to give the United States a legal opening in politically and economically influencing the Panama isthmus, which was part of New Granada at the time, but was later to become the independent country of Panama in accordance with the wishes of the United States. In 1903, however, the United States failed to gain access to a strip on the isthmus for the construction of a canal, and reversed its position on Panamanian secession from the Republic of Colombia.
