Question: Diagonal Norte is a station located near a national historic monument erected in what year?

Context paragraphs:
Thomas Paine Monument: The Thomas Paine Monument is a bronze sculpture located in New Rochelle, New York, dedicated to perpetuating the legacy of Founding Father Thomas Paine.  The monument stands on North Avenue at the entrance to Paine Avenue, between the Thomas Paine National Historical Association to the north and the property of the Huguenot and Historical Association of New Rochelle to the south.  This is the oldest extant memorial to Thomas Paine.  The original monument erected in 1839 consisted of just a tapered marble pedestal and decorative cap.  A bronze bust of Paine was later added in 1899.

Vigilant Fire Company Firemen's Monument: Vigilant Fire Company Firemen's Monument is a historic monument located at Washington Township, Lehigh County, Pennsylvania.  It was erected in 1909, and is a 16-foot-high granite monument on a concrete base.  It incorporates a 7-foot-tall statue of an early 20th-century fireman with a handlebar mustache, pointed fire hat, fire coat and boots, and holding a young girl in both arms.  The plot includes three burials.

Elon College Historic District: Elon College Historic District is a national historic district located on the campus of Elon University at Elon, Alamance County, North Carolina.  It encompasses 6 contributing buildings and 1 contributing object that form the historic core of the Elon College campus.  They are the West Dormitory (1907), and five buildings built between 1923-1927 which form an H-shaped complex: Alamance Building, Whitley Auditorium, Carlton Library, Duke Science Building, and Mooney Christian Science Building.  The object is a monument erected in 1929.  All of the buildings are three-story red brick buildings of Colonial Revival / Georgian Revival design.

Major John André Monument: Major John André Monument, also known as the Site of Major John André's Hanging and Burial, is a historic monument located at Tappan in Rockland County, New York.  It is a gray granite monument erected in 1879 and approximately 40 inches square and 58 inches tall.  It is located in a circular plot approximately 31 feet in diameter.  It commemorates the site of the hanging of Major John André on October 2, 1780.

Sarmiento House: The Sarmiento House is a National Historic Monument in the northern suburb of Tigre, Buenos Aires, Argentina.  It was the former residence from 1855 until his death in 1888 of Domingo Sarmiento, the 7th President of Argentina.  It was declared a National Historic Monument in 1966 and is now a museum.

Plaza de la República (Buenos Aires): Plaza de la República ("Republic Square") is a city square in Buenos Aires, capital of Argentina.  It is located in the San Nicolás quarter, at the intersection of the city's three main arteries: Ninth of July Avenue, Corrientes Avenue, and "Diagonal Norte".  It derives its name and associations from a church once sited on the square, San Nicolás de Bari (demolished in the 1930s for the creation of 9th of July Avenue), where the country's national flag was hoisted for the first time.

Diagonal Norte (Buenos Aires Underground): Diagonal Norte is a station on Line C of the Buenos Aires Underground.  From here, passengers may transfer to Carlos Pellegrini Station on Line B or 9 de Julio Station on Line D and Metrobus 9 de Julio.  It is located near the Obelisco de Buenos Aires.

Buford's Massacre Site: Buford's Massacre Site, also known as Buford’s Battleground, is a historic site and national historic district located near Lancaster, Lancaster County, South Carolina.  Two monuments now mark the Buford Battleground.  A white monument ten feet tall, erected on June 2, 1860, marked the American gravesite.  This marker became so scarred from chippings of souvenir hunters that a new monument was erected on May 1, 1955, bearing the same inscription.  Buford’s Massacre was one of the many vicious actions that characterized the Revolutionary War campaigns in the backcountry South.  This particular battle became a symbol of British atrocities and Tarleton became known as “Bloody Tarleton.”

Daniel Morgan Monument: Daniel Morgan Monument is a historic monument located at Spartanburg, Spartanburg County, South Carolina.  The statue was designed by John Quincy Adams Ward and the monument erected in 1881.  The monument commemorates the centennial of the victory at the Revolutionary War Battle of Cowpens and its hero, General Daniel Morgan.  The statue stands on a columnar granite shaft on an octagonal base designed by noted Charleston architect, Edward Brickell White.  In 1960, the monument was moved about 100 yards across Morgan Square to its east end.  However, in 2005 as part of a larger project involving the redesign and reconstruction of Morgan Square, the monument was returned to its original position at the corner of West Main and Magnolia Streets and its original orientation, facing Cowpens National Battlefield.

Obelisco de Buenos Aires: The Obelisco de Buenos Aires (Obelisk of Buenos Aires) is a national historic monument and icon of Buenos Aires.  Located in the Plaza de la República in the intersection of avenues Corrientes and 9 de Julio, it was erected in 1936 to commemorate the fourth centenary of the first foundation of the city.

Supporting paragraphs: Diagonal Norte (Buenos Aires Underground) Obelisco de Buenos Aires
Answer: 1936