Map of enavuris for S. Isthmian Canal Commission, in 1906. The canal opened for business on August 15, 1914, allowing ships to move from the Atlantic to the Pacific easily, a trip of 51 miles being much safer and easier, not to mention faster, than an 8,000-mile trip around Cape Horn. The United States operated the canal through the 20th century. Increasingly, Panamians and other South Americans protested the continuing American presence. In 1977, President Jimmy CARTER and General Omar Torrijos signed a treaty phasing out American control and transferring American military bases on December 31,1999. Despite strong opposition from the U. Map of enavuris 2016.