Question: To what political party did the last president covered by Stanley Tretick belong?

Context paragraphs:
Unity Party (South Ossetia): The Unity Party (Ossetian: Иудзинад , Georgian: ერთიანობის , Russian: Единство ; officially, the South Ossetian Republican Political Party "Unity") is a major political party with a socially conservative ideology in South Ossetia, a partially recognized Caucasian republic, considered by most countries to be a part of Georgia.  The Unity Party, founded in 2003, supported former President Eduard Kokoity, and was for a decade the largest political party in South Ossetia.  After the 2009 elections, the party held 17 out of 34 seats in South Ossetia's parliament.  It is modeled after and is closely linked to the United Russia party, with which it has signed an inter-party cooperation agreement.  The party is a winner of the 2004 and 2009 parliamentary elections.

Stanley Tretick: Aaron Stanley Tretick (July 21, 1921 – July 23, 1999) was an American photojournalist who worked for UPI, "Look", and "People" magazines.  He covered every president from Harry S. Truman through George H. W. Bush.  Tretick also did stills for many films, including "All the President's Men".  He is best known today for the photographs he took of John F. Kennedy’s 1960 campaign and presidency.  In the final issue of "Look", in 1971, Tretick was called "President Kennedy's photographic Boswell."

All Progressives Congress: The All Progressives Congress (APC) is a political party in Nigeria, formed on 6 February 2013 in anticipation of the 2015 elections.  APC candidate Muhammadu Buhari won the presidential election by almost 2.6 million votes.  Incumbent President Goodluck Jonathan conceded defeat on 31 March.  This was the first time in Nigeria's political history that an opposition political party unseated a governing party in a general election and one in which power transferred peacefully from one political party to another.  In addition, the APC won the majority of seats in the Senate and the House of Representatives in the 2015 elections, though it fell shy of winning a super-majority to override the ability of the opposition People's Democratic Party to block legislation.

Liberal Democratic Party (Republic of Macedonia): The Liberal Democratic Party (Macedonian: Либерално-демократска Партија, "Liberalno-demokratska Partija") is a liberal political party in the Republic of Macedonia.  The Liberal Democratic Party was launched in April 1997 as a merger between the Liberal Party and the Democratic Party.  The first leader of the party was Petar Goshev from the Democrats, who was also the last president of the League of Communists of Macedonia.  When the Liberal Party was re-established in 1999, a significant portion of the former Liberal Party remained in LDP.

Civic Force: Civic Force (Romanian: "Forța Civică" , FC) was a political party in Romania.  It was founded in 2004 by former Mayor of Bucharest Viorel Lis.  Its last president was former Prime Minister Mihai Răzvan Ungureanu, elected at the September 2012 party congress until 2014 when the party was absorbed by the Democratic Liberal Party (PDL).

James Spriggs Payne: James Spriggs Payne (December 19, 1819 – January 31, 1882) served as the fourth and eighth President of Liberia, from 1868 to 1870 and from 1876 to 1878.  He was the last President to belong to Liberia's Republican Party.

1916 Republican National Convention: The 1916 Republican National Convention was held in Chicago from June 7 to June 10.  A major goal of the party's bosses at the convention was to heal the bitter split within the party that had occurred in the 1912 presidential campaign.  In that year, Theodore Roosevelt bolted the GOP and formed his own political party, the Progressive Party, which contained most of the GOP's liberals.  William Howard Taft, the incumbent president, won the nomination of the regular Republican Party.  This split in the GOP ranks divided the Republican vote and led to the election of Democrat Woodrow Wilson.  Although several candidates were openly competing for the 1916 nomination—most prominently conservative Senator Elihu Root of New York, Senator John W. Weeks of Massachusetts, and liberal Senator Albert Cummins of Iowa—the party's bosses wanted a moderate who would be acceptable to all factions of the party.  They turned to Supreme Court Justice Charles Evans Hughes, who had served on the court since 1910 and thus had the advantage of not having publicly spoken about political issues in six years.  Although he had not sought the nomination, Hughes made it known that he would not turn it down; he won the nomination on the third ballot.  Former Vice-President Charles W. Fairbanks was nominated as his running mate.  Hughes was the only Supreme Court Justice to be nominated for president by a major political party.  Fairbanks (as of 2016) was the last former vice president, to be nominated for vice president.

Greens Party (Turkey): Greens Party (Turkish: "Yeşiller Partisi" ) was a green liberal party in Turkey.  Being the 57th political party of Turkey, it was established on June 30, 2008 after years of preparation since 2002.  A green party with the same name was established prior its establishment in 1988 (its founding President was former Health Minister Celal Ertuğ).  The latter was closed down in 1994, and its third and last President was Aydın Ayas, who took the eco-liberal turn for the party.  Greens maintain local branches and initiatives in İstanbul, Ankara, İzmir, Bursa, Tekirdağ, and Antalya.  Greens were known as the Greens of Turkey (Turkish: "Türkiye'nin Yeşilleri, Yeşiller Partisi" ) prior to founding of the party.  The party held its first general congress on June 6, 2010.  In November 2012, it merged with the Equality and Democracy Party to form the Greens and the Left Party of the Future.

Federation Party: The Federation Party was Fiji's first formal political party.  The Citizens Federation, which had won three of the four seats reserved for Indo-Fijians at the 1963 elections, decided to formalize its role as a political party, which was officially founded on 21 June 1964 with A. D. Patel as President and Sidiq Koya as Vice-President.  The merger took place in time for the party to participate in the 1965 constitutional conference which was called to map out a path towards independence from the United Kingdom.  In 1968, the Federation Party merged with the National Democratic Party to form the National Federation Party, which is now (2015) the oldest political party in Fiji still in existence.

George H. W. Bush: George Herbert Walker Bush (born June 12, 1924) is an American politician who was the 41st President of the United States from 1989 to 1993 and the 43rd Vice President of the United States from 1981 to 1989.  A member of the Republican Party, he was previously a congressman, ambassador, and Director of Central Intelligence.  He is the oldest living former President and Vice President.  Previously known as simply "George Bush", since 2001, Bush has often been referred to as "George H. W. Bush", "Bush 41", "Bush the Elder", or "George Bush Senior" to distinguish him from his eldest son, George W. Bush, the 43rd President of the United States.

Supporting paragraphs: Stanley Tretick George H. W. Bush
Answer: Republican Party