The National Association in 1871 was comprised of nine teams: the Philadelphia Athletics, Chicago White Stockings, Boston Red Stockings, Washington Olympics, New York Mutuals, Troy Haymakers, Fort Wayne Kekiongas, Cleveland Forest Citys,and Rockford Forest Citys.
Cleveland Forest Cities and Ft. Wayne Kekiongas on May 4, 1871
30 teams
There are currently 30 teams.
30 teams
32
not many
It's not a meaningful question - many of the players who played in 1871 (the first year of the National Association) had been signed to their teams for a few years before the NA was formed.
Eight teams.
30
20
10
30 in MLB.