On December 12, 1846, at Bogotá, a new American chargé d’affaires, Benjamin Alden Bidlack, of Wilkes-Barre, Pennsylvania, acting entirely on his own initiative, signed a treaty with the government of President Tomás Cipriano de Mosquera. The critical agreement was contained in Article XXXV. New Granada guaranteed to the United States the exclusive right of transit across the Isthmus of Panama, “upon any modes of communication that now exist, or that may be, hereafter, constructed.” In exchange the United States guaranteed “positively and efficaciously” both the “perfect neutrality” of the
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