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Indiana
it was a merger with the nfl and afl which eventually turned the NFC and AFC and into the nfl.
Pittsburg, Baltimore and Cleveland
They were a charter member of the AFL in 1960 and were part of the AFL-NFL merger in 1970.
Steelers
The Dolphins joined the NFL when the AFL-NFL merger took place prior to the 1970 season. The Dolphins first season in the AFL was 1966 and were a member of the AFL East Division from 1966-1969.
They were in a league called the All-America Football Conference prior to joining the NFL. After the AFL/NFL merger, they were placed into the American Football Conference.
The Dolphins began as an AFL team in 1966 and entered the NFL in the 1970 merger of the two leagues.
1970; they entered the AFL in 1960.
The AFC. Used to be called the AFL before the merger with the NFL.
The Broncos entered the NFL in 1970 as part of the AFL-NFL merger. The Broncos were a charter member of the American Football League that began play in 1960.
Since the AFL/NFL merger, the Patriots have always Played in the Amercian Football Conferences' East Division.