Question: What is the nationality of the person who wrote "The Two Trees"?

Context paragraphs:
Deke House (Ithaca, New York): Deke House, the Delta Kappa Epsilon or "Deke" House on the campus of Cornell University, was built in 1893 and was listed on the National Register of Historic Places in 1991.  It was designed by William Henry Miller to serve as a fraternity house.  Two trees which Theodore Roosevelt planted in front of the house are on the National Register of Historic Trees.

W. B. Yeats: William Butler Yeats ( ; 13 June 186528 January 1939) was an Irish poet and one of the foremost figures of 20th century literature.  A pillar of both the Irish and British literary establishments, he helped to found the Abbey Theatre, and in his later years served as an Irish Senator for two terms.  Yeats was a driving force behind the Irish Literary Revival along with Lady Gregory, Edward Martyn and others.

Multiple citizenship: Multiple citizenship, also called dual citizenship or multiple nationality or dual nationality, is a person's citizenship status, in which a person is concurrently regarded as a citizen of more than one state under the laws of those states.  There is no international convention which determines the nationality or citizen status of a person, which is defined exclusively by national laws, which vary and can be inconsistent with each other.  Multiple citizenship arises because different countries use different, and not necessarily mutually exclusive, criteria for citizenship.  Colloquial speech refers to people "holding" multiple citizenship but technically each nation makes a claim that this person be considered its national.

Siddha Vinayaka: Panchama is a small village famous for the temple of Panchama Ganesh or Siddha Vinayaka as it is locally known.  Legend says that the Gajapati King Purushottama deva (15th century) of Puri on the way to his conquest of the Kanchi Kingdom recovered the image in the hollow of two trees of Bara and Ashwattha and paid his homage to the image after its consecration.  Since then the place is sanctified and has become an important centre of Ganapataya worship, preserving the great tradition of Panchadevata worship of Orissa.  The idol still remains inside the trunk of two large ficus trees.  A temple is constructed around it.  Around 200,000 devotees from Orissa and Andhra Pradesh visit this shrine on the day of Ganesh Chaturthi.

Shattered Mirror: Shattered Mirror is a vampire novel written by Amelia Atwater-Rhodes, published in 2001 when the author was 17.  W. B. Yeats’ poem "The Two Trees", which references broken glass, appears in the beginning of the book, and is the inspiration for the title.  The main theme of the book is that the perceived heroes can sometimes be evil in their actions and the villains can sometime have good sides.  It is a comment that things are not just one thing or the other, but mixed with qualities of all aspects of life.

Venezuelan nationality law: Venezuelan nationality law is based on the principle of Jus soli.  Any person born in Venezuela acquires Venezuelan citizenship at birth, irrespective of nationality or status of parents.  Nationality law is regulated by Section 1 of Chapter 2 of the Constitution of Venezuela and by the Nationality and Citizenship Act of 2004 .

Two Trees of Valinor: In J. R. R. Tolkien's legendarium, the Two Trees of Valinor are Telperion and Laurelin, the Silver Tree and the Gold that brought light to the Land of the Valar in ancient times.  In Tolkien's fiction, Valinor was a paradisiacal realm also known as the Undying Lands where angelic beings lived.  The Two Trees were apparently of enormous stature, and their dew was of a pure and magical light in liquid form.  They were destroyed by Ungoliant at Melkor's behest, but their last flower and fruit were made by the Valar into the Moon and the Sun.

Silmaril: The Silmarils (Quenya pl.  Silmarilli, "radiance of pure light") are three fictional brilliant jewels composed of the unmarred light of the Two Trees in J. R. R. Tolkien's legendarium.  The Silmarils were made out of the crystalline substance "silima" by Fëanor, a Noldorin Elf, in Valinor during the Years of the Trees.  The Silmarils play a central role in Tolkien's book "The Silmarillion", which tells of the creation of Eä (the Universe) and the beginning of Elves, Men, and Dwarves.

Great Elm (Boston): The Great Elm stood at the center of the Boston Common until February 15, 1876.  The earliest maps of the area only showed three trees, one of which was the Great Elm.  The other two trees, one of which was most likely the famed Liberty Tree, had been lost long before the Great Elm finally fell in the nineteenth century.  Up to that point, the elm symbolized the Boston Common's landscape since—an early advocate for urban improvement asserted—the figure represented the finest example of "the favorite ornamental tree among us."  The Great Elm's popularity inspired broader environmental efforts within the region.  Consequently, planters believed that they "must plant [elms and oaks] for posterity," implicitly hoping that their efforts would result in a similar majestic outcome.  These ancillary planting efforts elevated the popularity of the largest tree in the area, the Great Elm.

Teil tree: The Oxford English Dictionary gives the etymology of teil as Latin "tilia" and Old French (13th to 15th centuries) "til".  In Modern French it is "tilleul".  The French and Latin word cognates appeared amongst the English literate classes starting in the 14th century.  Most names of trees, however, kept their Germanic origins, hence linden and lime (a deformation of lind according to the OED).  The linden or til tree is native to northern Europe and Asia.  In various versions of Protestant Bibles the til is sometimes confused with the terebinth, which is a tree native to southern Europe, North Africa, and the Middle East.  One variety of terebinth furnishes the pistachio nut and the thick bark of the tree is a source of a highly valued varnish and particular turpentine (Modern French, térébenthine).  The English and French translations in the Roman Catholic Douay Bible from the Vulgate do not confuse the two trees.

Supporting paragraphs: Shattered Mirror W. B. Yeats
Answer: Irish