The NWA World Tag Team Championship is the main professional wrestling world tag team championship of the National Wrestling Alliance (NWA).
 When the NWA was founded in 1948 the NWA Board of Directors allowed any NWA member promotions to create their own "NWA World Tag Team Championship" without interference or oversight from the board of directors.
 The first of these NWA World Tag Team Championships was created in 1950 in the San Francisco territory, which while billed as a "World" title was essentially restricted to the specific NWA territory.
 From the first championship was created in 1950 until 1982 several versions of the tag team championship existed, in 1957 as many as 13 different versions of the NWA World Tag Team Championship were confirmed to be in existence.
 In 1982 Big Time Wrestling, based in Los Angeles, closed and abandoned their version of the championship.
 This meant that only the Jim Crockett Promotions' (JCP) NWA World Tag Team Championship was active, but still restricted to being controlled by JCP, not the NWA board of directors.
 In 1991 that championship was renamed the World Championship Wrestling Tag Team Championship.
The Haas Brothers was a Professional wrestling Tag team consisting of real life brothers Charlie and Russ Haas.
 The team was very successful in the independent wrestling circuit, but Russ's death on December 15, 2001 led to the end of the tag team shortly after the brothers signed a contract with the World Wrestling Federation.
The WWE Raw Tag Team Championship is a professional wrestling world tag team championship contested in WWE on the Raw brand.
 Introduced in 2002 as the WWE Tag Team Championship, it was WWE's third world tag team title, and seventh tag team title overall.
 After WWE bought the promotions of Extreme Championship Wrestling (ECW) and World Championship Wrestling (WCW), and unified the WCW Tag Team Championship into its own title at Survivor Series 2001, it split its roster into two brands, Raw and SmackDown, in a brand extension.
 As a result of this, WWE's original World Tag Team Championship was designated exclusive to the Raw brand, leaving SmackDown without a tag team championship.
 Soon afterward, the WWE Tag Team Championship was introduced onto the SmackDown brand.
The IWGP Tag Team Championship is a professional wrestling tag team championship owned by the New Japan Pro-Wrestling (NJPW) promotion.
 "IWGP" is the acronym of the NJPW's governing body, the International Wrestling Grand Prix.
 The title was introduced on December 12, 1985, at a NJPW live event.
 The IWGP Tag Team Championship is not the only tag team title contested for in NJPW; the IWGP Junior Heavyweight Tag Team Championship is also sanctioned by NJPW.
 According to NJPW's official website, the IWGP Tag Team Championship is considered the "IWGP Heavy Weight Class", while the Junior Heavyweight Tag Team Championship is listed as the "IWGP Jr.
 Tag Class".
 Like most professional wrestling championships, the title is won via the result of a scripted match.
 Title changes usually happen at NJPW-promoted events; although the title has only changed hands twice at a non-NJPW event, it has been defended in several other promotions.
The KO-D (King of DDT) 6-Man Tag Team Championship is a professional wrestling championship owned by the DDT Pro-Wrestling promotion.
 As the name of the title suggests, it is meant for tag teams of three wrestlers.
 The title was first announced during DDT's year-end event on December 23, 2012, becoming the promotion's fifth active title.
 DDT had previously promoted matches for the DDT Jiyugaoka Six-Person Tag Team Championship, the DDT Nihonkai Six-Man Tag Team Championship and the UWA World Trios Championship, but although all three titles were last held by DDT wrestlers, none of them have been seen in the promotion since the end of 2010.
 The inaugural KO-D 6-Man Tag Team Champions were determined on January 12, 2013, in a four-team single-elimination tournament, which saw Team Drift (Keisuke Ishii, Shigehiro Irie and Soma Takao) defeat Team Shiro (Akito, Makoto Oishi and Sanshiro Takagi) in the finals to win the title.
 The title has also been defended in All Japan Pro Wrestling (AJPW) as part of a relationship between DDT and AJPW.
The NWA/ECCW Tag Team Championship is the tag team title for the wrestling promotion based out of British Columbia.
 It was activated in 1996.
 The first champions were the Glamour Order Of Discipline.
 There have been 49 reigns by 34 teams and 55 wrestlers with three vacancies.
 One of the vacancies came when the titles were vacated by NWA Pacific Northwest representative Mike Sweetster after ruling that the July 24, 2009 match was not an official contest and was thus null and void.
 The titles are currently being held by Scotty Mac and Jamie Diaz who are in their first reign.
 On April 19, 2013, ECCW unveiled new belts for the Elite Tag Team Championships.
 Then champions Scotty Mac and Jamie Diaz relinquished the old NWA/ECCW Tag Team Championships to their stable mates The Greedfather and Red Dinero to have, who later deemed them the "ECCW Classic Tag Team Championships".
The NWA Gulf Coast Tag Team Championship was the main tag team championship in Gulf Coast Championship Wrestling or NWA Gulf Coast.
 The Gulf Coast tag team championship is the successor for GCCW's version of the NWA Southern Tag Team Championship that was promoted in the Tennessee, Alabama, Florida and Mississippi region from 1955 until 1967 where it was replaced by the "NWA Gulf Coast Tag Team Championship.
 The Gulf Coast Tag Team championship was promoted from 1967 until 1978 where Southeast Championship Wrestling took control of the title renaming in back to the "NWA Southern Tag Team Championship" and promoted it in its "Southern Division" in 1978 and 1979.
 In 1980 the Southern Division was abandoned and the Northern Division of the NWA Southern Tag Team Championship became the main title of SECW.
Charles Doyle "Charlie" Haas II (born March 27, 1972) is an American semi-retired professional and amateur wrestler.
 He is best known for his appearances with World Wrestling Entertainment (WWE) in the 2000s and Ring of Honor (ROH) in the 2010s.
The IWGP Junior Heavyweight Tag Team Championship is a professional wrestling tag team championship owned by the New Japan Pro-Wrestling (NJPW) promotion.
 "IWGP" is the acronym of NJPW's governing body, the International Wrestling Grand Prix.
 The title was introduced on August 8, 1998, at a NJPW live event.
 The IWGP Junior Heavyweight Tag Team Championship is not the only tag team title contested for in NJPW; the IWGP Tag Team Championship is also sanctioned by NJPW.
 According to NJPW's official website, the Junior Heavyweight Tag Team Championship is listed as the "IWGP Jr.
 Tag Class", while the IWGP Tag Team Championship is considered the "IWGP Heavy Weight Class".
 The title is contested for by junior heavyweight wrestlers; the weight-limit for the title is 100 kg per partner.
 Being a professional wrestling championship, the title is won as a result of a predetermined outcome.
The IWGP Tag Team Championship is a professional wrestling tag team championship owned by the New Japan Pro-Wrestling (NJPW) promotion.
 "IWGP" are the initials of NJPW's governing body, the International Wrestling Grand Prix.
 The title was introduced on December 12, 1985, at a NJPW live event.
 The IWGP Tag Team Championship is not the only tag team title contested for in NJPW; the IWGP Junior Heavyweight Tag Team Championship is also sanctioned by NJPW.
 According to NJPW's official website, the IWGP Tag Team Championship is considered the "IWGP Heavy Weight Class", while the Junior Heavyweight Tag Team Championship is listed as the "IWGP Jr.
 Tag Class".
 Like most professional wrestling championships, the title is won via the result of a scripted match.
 Title changes usually happen at NJPW-promoted events; although the title has only changed hands twice at a non-NJPW event, it has been defended in several other promotions.

Question: What nationality were the Tag team wrestlers the Haas Brothers?
Answer: American