Question: Which of these two canals was built first: Junction Canal or Duluth Ship Canal?  

Context paragraphs:
Duluth Ship Canal: The Duluth Ship Canal is an artificial channel cut through Minnesota Point, providing direct access to Duluth harbor from Lake Superior.  Begun privately in 1871, it was put under federal supervision and maintenance several years later.  It is still an important component of the harbor facilities.

Saint Lawrence River Divide: The Saint Lawrence River Divide separates the Great Lakes Basin from the rest of the Atlantic Ocean watershed.  Two canals cross the divide: The Chicago Sanitary and Ship Canal crosses the Chicago Portage and connects Lake Michigan to the Mississippi River watershed.  The Erie Canal connects Lake Erie to the Hudson River watershed.  Historically there were additional canals, e.g., the Ohio and Erie Canal, but most of these are no longer in operation.

Duluth North Pier Light: The Duluth North Pier Light is a lighthouse on the north breakwater at the entrance to the Duluth Ship Canal.

Duluth South Breakwater Outer Light: The Duluth South Breakwater Outer Light is a lighthouse at the end of the south breakwater of the Duluth Ship Canal.  It forms a range with the Duluth South Breakwater Inner Light.

Droitwich Canal: The Droitwich Canal is a synthesis of two canals in Worcestershire, England; the Droitwich Barge Canal and the Droitwich Junction Canal.  The Barge Canal is a broad canal which opened in 1771 linking Droitwich Spa to the River Severn at Hawford Mill, Claines.  The Droitwich Junction Canal is a narrow canal, opened in 1854, which linked Droitwich to the Worcester and Birmingham Canal.  Both were built to carry salt, and were abandoned in 1939.  They have been the subject of a restoration plan since 1973, and the Barge Canal was officially reopened in 2010, while the Junction Canal reopened in July 2011.  Following the opening of the canal, ownership transferred to the newly created Canal and River Trust

Berks and Hants Canal: The Berks and Hants Canal, incorporated as the Berkshire and Hampshire Junction Canal Company, was a proposed (but unbuilt canal) in the English counties of Berkshire and Hampshire.  Proposals for the waterway originate after the completion of the Kennet and Avon Canal and the Basingstoke Canal in the 1790s, with a view to connecting the two canals.

Shrewsbury Canal: The Shrewsbury Canal (or Shrewsbury and Newport Canal) was a canal in Shropshire, England.  Authorised in 1793, the main line from Trench to Shrewsbury was fully open by 1797, but it remained isolated from the rest of the canal network until 1835, when the Birmingham and Liverpool Junction Canal built the Newport Branch from Norbury Junction to a new junction with the Shrewsbury Canal at Wappenshall.  After ownership passed to a series of railway companies, the canal was officially abandoned in 1944; many sections have disappeared, though some bridges and other structures can still be found.  There is an active campaign to preserve the remnants of the canal and to restore the Norbury to Shrewsbury line to navigation.

Duluth South Breakwater Inner Light: The Duluth South Breakwater Inner Light is a lighthouse on the south breakwater of the Duluth Ship Canal in Duluth, Minnesota, United States.  It forms a range with the Duluth South Breakwater Outer Light to guide ships into the canal from Lake Superior.

Junction Canal: The Junction Canal was a canal in the states of New York and Pennsylvania in the United States.  The canal was also called the Arnot Canal, after the name of its principal stockholder, John Arnot of Elmira, New York.  The canal was built and operated by a private stock company.  The canal was partly open in 1854, but the entire length was not finished until 1858.  The completed canal was 18 mi long and had 11 locks.  Then intent was to lengthen the reach of the Chemung Canal deeper into Pennsylvania in order to connect to the canal systems there.  Competition with railroads led to diminished use of the canal.  In 1865 the canal was severely damaged by a flood.  In 1866, the stock company was authorized to change its name to the "Junction Canal and Railroad Company," and work commenced in constructing a railroad on its right of way.  The canal was last used in 1871, and was then abandoned.

Birmingham and Warwick Junction Canal: The Birmingham and Warwick Junction Canal is a short canal connecting the Digbeth Branch of the Birmingham and Fazeley Canal in the centre of Birmingham ( ) to the Warwick and Birmingham Canal near Gravelly Hill Interchange ( ).  It was authorized in 1840 by Act of Parliament to relieve pressure on this connection to the Grand Junction Canal leading to London and opened in 1844.  It is 2.5 miles long and has 6 locks.

Supporting paragraphs: Junction Canal Duluth Ship Canal
Answer: Junction Canal