Treaty allowed the United States to begin constructing this entity.
The Darien Scheme was an attempt by Scotland to create another structure similar to this entity. The Hay-Bunau Varilla (HAY BOO-now vah-REE-yuh) Treaty allowed the United States to begin constructing this entity. A zone around it was returned from the U.S. to its namesake country by a treaty signed by Jimmy Carter. For 10 points, name this waterway that connects the Atlantic and Pacific Oceans through a Central American country.
The Darien Scheme was an attempt by Scotland to create another structure similar to this entity.
{Panama Canal} [or {Canal} de {Panama}]