The museum informs visitors that Ansons career involved four years in the National Association and that Ansons statistics might have been radically different had he not refused to play against African Americans .
The National Association many purists do not recognize as a major league .
The museum informs visitors that Ansons career involved four years in the National Association , which many purists do not recognize as a major league , and that Ansons statistics might have been radically different had he not refused to play against African Americans .