Question: Who became president in 2015 of the country whose ambassador to the United States from 1910 to 1919 was Rómulo Sebastián Naón? 

Context paragraphs:
Adolfo Díaz: Adolfo Díaz Recinos (15 July 1875 Alajuela, Costa Rica – 29 January 1964, San José, Costa Rica) was the 12th President of Nicaragua between 9 May 1911 and 1 January 1917 and 18th between 14 November 1926 and 1 January 1929.  Born in Costa Rica to Nicaraguan parents in 1875, he worked as a secretary for the La Luz y Los Angeles Mining Company, an American company chartered in Delaware that owned the large gold mines around Siuna in eastern Nicaragua.  In this capacity, he helped channel funds to the revolt against Liberal President José Santos Zelaya, who had incurred the anger of the United States by negotiating with Germany and Japan to resurrect the proposed Nicaragua Canal.  Díaz became Vice President of Nicaragua in 1910.  After he became president in 1911, Díaz was forced to rely on U.S. Marines to put down a Liberal revolt, which resulted in a contingent of Marines remaining in Nicaragua for over a decade.  In return, in 1914, he signed the Bryan-Chamorro Treaty, which granted the United States exclusive rights to build an inter-oceanic canal across Nicaragua.

John J. Dempsey: John Joseph Dempsey (June 22, 1879 – March 11, 1958) was a United States Representative from New Mexico who also served as the 13th Governor of New Mexico.  He was born in White Haven, Pennsylvania, where he attended grade school.  Employed as a telegrapher, he held various positions with the Brooklyn Union Elevator Company.  He was the vice president of the Brooklyn Rapid Transit Company until 1919 when he entered the oil business in Oklahoma and became vice president of the Continental Oil and Asphalt Company.  He moved to Santa Fe, New Mexico, in 1920 and was an independent oil operator and in 1928 became president of the United States Asphalt Company.

Harry K. Thomas Jr.: Harry Keels Thomas Jr. (born June 3, 1956 in the Harlem section of New York City) is an American diplomat and current United States Ambassador to Zimbabwe.  He served as the United States Ambassador to the Philippines from 2010 to 2013.  A former United States Ambassador to Bangladesh (serving from 2003 to 2005) and Director General of the United States Foreign Service (serving from 2007 to 2009), Thomas was designated by US President Barack Obama on November 19, 2009 to replace Kristie Kenney as Ambassador to the Philippines—the first African American to serve at that post.  He was confirmed by the United States Senate on March 19, 2010 and presented his credentials to Philippine president Gloria Macapagal-Arroyo on April 27, 2010 He was then nominated and confirmed as the United States Ambassador to Zimbabwe on October 22, 2015.  He was sworn in on December 8, 2015.

Rómulo Sebastián Naón: Rómulo Sebastián Naón Peralta Martínez (1875–1941), was an Argentine lawyer, politician and Ambassador to the United States from 1910 to 1919.

Bahá'í Faith in Bolivia: The Bahá'í Faith in Bolivia begins with references to the country in Bahá'í literature as early as 1916.  The first Bahá'í to arrive in Bolivia was in 1940 through the beginning of the arrival of coordinated pioneers, people who chose to move for the growth of the religion, from the United States.  That same year the first Bolivian joined the religion.  The first Bahá'í Local Spiritual Assembly was elected in La Paz in 1945 and the first Indian formally joined the religion in 1956 which soon spread widely among that subculture.  The community elected an independent National Spiritual Assembly in 1961.  By 1963 there were hundreds of local assemblies.  The Bahá'í Faith is currently the largest international religious minority in Bolivia.  The largest population of Bahá'ís in South America is in Bolivia, a country whose general population is estimated to be 55%-70% indigenous and 30%-42% Mestizo, with a Bahá'í population estimated at 217,000 in 2005 according to the Association of Religion Data Archives.

Argentina–United States relations: The Argentine Republic and the United States of America have maintained bilateral relations since the United States formally recognized the United Provinces of the Río de la Plata, the predecessor to Argentina, on January 27, 1823.  Since 1998, Argentina has been the only designated major non-NATO ally in Latin America, partly owing to Argentina's assistance to the United States in the Gulf War.  Relations have been strained at times over the past few years, especially during the Cristina Fernández de Kirchner administration, but they have improved somewhat since President Mauricio Macri came to power in late 2015.

Moroccan–American Treaty of Friendship: In December 1777, the Moroccan Sultan Muhammad III included the United States of America in a list of countries to which Morocco’s ports were open.  Morocco thus became the first country whose head of state publicly recognized the new United States.  Relations were formalized with the Moroccan–American Treaty of Friendship negotiated by Thomas Barclay, and signed by Thomas Jefferson, John Adams and Muhammad III in 1786.

José María Campo Serrano: José María Campo Serrano (8 September 1832 – 6 January 1915) was a Colombian lawyer, general, and statesman, who became President of Colombia after the resignation of the President and the dismissal of the Vice President.  He sanctioned the Constitution of 1886 that created the Republic of Colombia proceeding the United States of Colombia.  A Samarian Costeño, he became president of the Sovereign State of Magdalena, and Antioquia, Governor of Panama, and held various Ministries during his career as a politician.

Tulinabo S. Mushingi: Tulinabo Salama Mushingi (born August 4, 1956) is an American diplomat who currently serves a joint appointment as United States Ambassador to Senegal and United States Ambassador to Guinea-Bissau.  He previously served as the United States Ambassador to Burkina Faso from 2013 to 2016.  He also served in the executive offices of Secretaries of State John F. Kerry and Hillary Clinton.  In February 2017, President Donald Trump nominated Mushingi to serve concurrently as United States Ambassador to Senegal and United States Ambassador to Guinea-Bissau.  Mushingi had originally been nominated for the position by outgoing President Barack Obama in January 2017.  When Trump took office, he withdrew Mushingi's nomination before renominating him for the same position.  He was confirmed by the United States Senate by voice vote on May 18, 2017.

Yuli Vorontsov: Yuli Mikhailovich Vorontsov (also Yuliy Vorontsov; Russian: Ю́лий Миха́йлович Воронцо́в ) (October 7, 1929, Leningrad  – December 12, 2007, Moscow) was a Russian and Soviet diplomat, President of International Centre of the Roerichs (Moscow).  In the mid-1970s he was Chargé d'Affaires at the Soviet embassy in Washington under Ambassador Dobrynin.  He was then Ambassador to India (1978-1983) and France (1983-1986).  He returned to Moscow to be the first deputy foreign minister (1986-1990) and participated in arms reduction talks with the United States.  In 1988-1989, he was simultaneously the Ambassador to Afghanistan as Soviet troops withdrew from the country.  He then served as the last Soviet ambassador to United Nations between 1990 and 1991 and as the first Russian Permanent Representative to the UN from 1991 to 1994.  After this he served as the Russian ambassador to the United States from 1994 to 1998.  In 2000 Vorontsov was chosen as the high-level coordinator for issues related to a paragraph of United Nations Security Council Resolution 1284 which once again required Iraq to face "its obligations regarding the repatriation or return of all Kuwaiti and third country nationals or their remains, [and] the return of all Kuwaiti property [...] seized by Iraq" (during the invasion of Kuwait).

Supporting paragraphs: Rómulo Sebastián Naón Argentina–United States relations
Answer: Mauricio Macri