Major league teams only. Leagues considered below
Football- NFL, AFL; Basketball- NBA, ABA, BAA; Hockey- NHL, WHA; Baseball- MLB (AL, NL), AA, PL, UA, FL, Major Negro Leagues according to MLB
Negro Leagues: NNL (1920-1931, 1933-1948), ECL (1923-1928), ANL (1929), EWL (1932), NSL (1932), NAL (1937-1948)
City is based on team name. If the name reflects the state, the metro area the team was located in is considered, but only if it centered in the state in the team name, with some leniency
Some team names include former cities or neighborhoods, those must be named separately