Jens Johnnie Pulver (born December 6, 1974) is an American professional mixed martial artist and undefeated boxer and kickboxer.
 Pulver was the inaugural UFC Lightweight Champion in addition to serving as the head coach on "The Ultimate Fighter 5" reality show against long-time rival B.J. Penn.
 In mixed martial arts, Pulver competed at the Lightweight, Featherweight, Bantamweight and Flyweight divisions in addition to competing at the Middleweight, Light Middleweight, and Welterweight divisions as a professional boxer.
 While perhaps best known for competing in the UFC, Pulver has also competed in Pride Fighting Championships, for the PRIDE 2005 Lightweight Grand Prix.
 He is to-date the youngest UFC Lightweight Champion in the UFC history, eventually relinquishing his title, after two defenses, due to a contract dispute.
 Pulver officially retired from combat sports in 2014.
 Pulver is considered the founder of the UFC lightweight division.
Forrest Griffin vs. Stephan Bonnar is a duo of fights starting in the finals of The Ultimate Fighter 1 contest which received national acclaim, and was highly regarded among fans as one of the most exciting, greatest and memorable fights in the history of not only the Ultimate Fighting Championship (UFC) but of mixed martial arts (MMA) in general.
 The bout was voted fight of the year by a poll of over 19,000 readers of the website MMAWeekly.com, and was recognized as the 2005 Shoot Match of the Year by the Wrestling Observer Newsletter.
 The fight was credited by Dana White as the "most important fight in UFC history".
 The fight was also voted the greatest fight in UFC history in 2009.
Noad Lahat (Hebrew: נועד להט‎ ‎ ; born June 8, 1984), also known by the nickname Neo, is an Israeli mixed martial artist who competes in the featherweight division.
 He is the second Israeli to ever fight in the UFC.
Anderson da Silva (] ; born April 14, 1975) is a Brazilian mixed martial artist and former UFC Middleweight Champion.
 Silva holds the longest title streak in UFC history, which ended in 2013 after 2,457 days, with 16 consecutive wins and 10 title defenses.
 He has 13 post-fight bonuses, the second most in UFC history.
 UFC president Dana White and several mixed-martial-arts publications have called Silva the greatest mixed martial artist of all time.
 He is currently ranked the #6 contender in official UFC middleweight rankings.
Jason DeLucia (born July 24, 1969) is a retired American mixed martial artist.
Demetrious Khrisna Johnson (born August 13, 1986) is an American mixed martial artist.
 He is the first ever and the current Flyweight Champion of the Ultimate Fighting Championship (UFC).
 He currently holds the longest active championship reign at ten title defenses.
 He is also the #1 ranked pound for pound MMA fighter in the world.
 Known for his quick striking and elusive movement, Johnson has also landed the most takedowns in UFC Flyweight history and holds the record for the latest finish in UFC history with a submission win at 4:59 of the fifth round against Kyoji Horiguchi.
 He is also the only UFC fighter to record over 10 takedowns in three different fights.
Daniel Jeffery Henderson (born August 24, 1970) is an American former mixed martial artist and Olympic wrestler, who last competed as a middleweight in the Ultimate Fighting Championship.
 He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight (80 kg ) and Middleweight (95 kg ) champion of Pride Fighting Championships.
 Additionally, Henderson was the Brazil Open '97 Tournament Champion, the UFC 17 Middleweight Tournament Champion, the Rings: King of Kings 1999 Tournament Champion and the Pride Weltwerweight Grand Prix Tournament Champion.
 During his career, Henderson also challenged for the UFC Middleweight Championship (2x), the UFC Light Heavyweight Championship and the Strikeforce Middleweight Championship.
 He was the first mixed martial artist to concurrently hold two titles in two different weight classes in a major MMA promotion.
 At the time of his retirement after UFC 204, he was the oldest fighter on the UFC roster.
 Known to be one of the greatest mixed martial artists of all time having defeated a total of seventeen MMA world champions across four major MMA promotions (UFC, PRIDE FC, Strikeforce, and RINGS).
Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner.
 Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1.
 Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship.
 In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions.
 As a former UFC Lightweight Champion and UFC Welterweight Champion, he is one of only three fighters in UFC history to win titles in multiple weight classes.
 Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale.
 Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record.
 Penn was inducted into the UFC Hall of Fame, as the inaugural inductee in the Modern-Era Wing by career-long rival Matt Hughes, during "International Fight Week" in July 2015.
Joseph Edward Lauzon Jr. (born May 22, 1984) is an American mixed martial artist competing in the UFC's Lightweight division.
 He is tied with Nate Diaz as having the most post-fight bonus awards in UFC history.
 Joe's younger brother, Dan Lauzon, is also a mixed martial artist.
Trent Jenkins is an American mixed martial artist.
 He competed in the Middleweight division.
 Jenkins also was in the first ever fight in UFC history losing to Jason DeLucia.

Question: What was the nationality of the mixed martial artist who defeated Trent Jenkins in the first ever fight in UFC history?
Answer: American