Question: The 1921 Louisville Brecks season was their inaugural season in the which organization,  Louisville, Kentucky had two professional American football teams in this league?

Context paragraphs:
Hubert Wiggs: Hubert Thomas Wiggs (September 29, 1893 – October 18, 1977) was a professional American football player and coach who played offensive lineman for three seasons for the Louisville Brecks.  He played college football for the Vanderbilt Commodores where he was a fullback on the "point-a-minute" 1915 team.

1923 Louisville Brecks season: The 1923 Louisville Brecks season was their third season in the league and final season as the Brecks.  The team failed to improve on their previous output of 1–3, losing all their games.  They tied for nineteenth place in the league.

1921 Louisville Brecks season: The 1921 Louisville Brecks season was their inaugural season in the National Football League.  The team finished 0–2 against league teams, and tied for eighteenth place in the league.

Jim Kendrick: James Marcellus Kendrick (August 22, 1893 – November 17, 1941) was a professional American football player during the early years of the National Football League (NFL) with the Toledo Maroons, Canton Bulldogs, Louisville Brecks, Chicago Bears, Hammond Pros, Buffalo Bisons, Rochester Jeffersons, Rock Island Independents, Buffalo Rangers and the New York Giants.  Kendrick was a part of the Bulldogs' 1922 NFL championship team and the Giants' 1927 NFL Championship team.

1922 Louisville Brecks season: The 1922 Louisville Brecks season was their second season in the league.  The team improved on their previous output of 0–2, winning one game.  They finished thirteenth in the league.

Bo Otto: Albert Bo Henry Otto (August 15, 1903 – October 7, 1983) was an American football player.  He was born in Louisville, Kentucky.  He played for the Louisville Brecks 1922–1923.  He played the center, guard, and tackle positions on the football field.  He weighed 182 lb .

Louisville (NFL): Louisville, Kentucky had two professional American football teams in the National Football League: the Louisville Breckenridges (or Brecks for short) from 1921 to 1924 and the Louisville Colonels in 1926.

Bob Karch: Robert Hosack Karch (July 4, 1894November 14, 1958) was a professional American football tackle in the National Football League.  He played for the Columbus Panhandles (1922) and the Louisville Brecks (1923).  He played college football at the Ohio State University.  He was also selected by Frank G. Menke, former sporting editor of the International News Service (INS), to his 1916 College Football All-America Team.  Karch sustained a heart attack in 1955 and shot and killed himself at his home in Bexley, Ohio, in 1958.

Wilfred Smith (American football): Wilfrid Russell Smith (April 7, 1899 - August 3, 1976) was an American football player who played six seasons in the National Football League with the Muncie Flyers, Louisville Brecks, Chicago Cardinals and Hammond Pros.  Smith played college football at DePauw University and attended Huntington High School in Huntington, Indiana.  He was a member of the Chicago Cardinals team that were NFL champions in 1925.  Smith compiled a 1926 All-Pro Team consisting of players from the National Football League and the American Football League for the Chicago Tribune.

1920 APFA season: The 1920 APFA season was the inaugural season of the American Professional Football Association—renamed the National Football League in 1922.  The league was formed on August 20, 1920, by independent professional American football teams from Ohio, all of whom had previously played in the Ohio League or New York Pro Football League (NYPFL).  At the meeting, they first called their new league the American Professional Football Conference.  A second organizational meeting was held in Canton on September 17, adding more teams to the league.  At the meeting, the name of the league became the American Professional Football Association.  Four other teams also joined the Association during the year.  Meanwhile, Jim Thorpe of the Canton Bulldogs was named the APFA's first president but continued to play for the team.

Supporting paragraphs: 1921 Louisville Brecks season Louisville (NFL)
Answer: National Football League