The Kansas City Royals were one of two expansion franchises to join the American League during the 1969 season. The other was the Seattle Pilots, who relocated after one year and became the Milwaukee Brewers.
Uh... Milwaukee did not 'join' the US. Wisconsin did, though!
The Houston Texans joined the National Football League as an expansion team in 2002.
It would be very hard for another entity to join Major League Baseball now that sports organizations are considering dropping teams.
The Bears were an original National Football League team that were assigned to the National Football Conference after the 1970 merger with the American Football League.
Hank Aaron made his Major League debut on April 13, 1954 with the Milwaukee Braves.
Aaron's first MLB game was April 13, 1954 for the Milwaukee Braves against the Cincinnati Reds. He played left field, batted 5th in the lineup, and went 0 for 5.
Jinnah left the Indian National Congress in 1913 to join the All India Muslim League.
The Edmonton Oilers first joined the National Hockey League (NHL) In 1979
The Atlanta Falcons joined the National Football League as an expansion team in 1966.