[PANAMA CANAL]. An original invitation to the Panama Pacific International Exposition, celebrating the completion of the Panama Canal. San Francisco, 20 February 1915. Bifolio, 8vo (206 x 152 mm). 2 vignettes printed on integral leaf. (Old folds, some marginal offsetting). In 1915, San Francisco hosted the world?s fair to celebrate the completion of the Panama Canal a year prior. A project that lasted a decade and caused significant financial setbacks, U.S. President Theodore Roosevelt showed the economic power and technological prowess of the United States by establishing a trans-isthmian canal that had eluded travelers and businessmen for centuries.