They were until 1970 when two leagues merged. From 1966, when the merger was planned to 1970 the leagues were still separate but played many games against each other.
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150 years for afl
AFL only played in four Super Bowls and were 2-2 other than that it has all been NFL. In 1970 AFL became the AFC and have won 19 and lost 22. NFL/NFC 23 - AFL/AFC 21
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Indiana
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.